Remove unused DisplayableEvent properties.

Now everything is using events, we don't need the legacy
format identifier.

src/com/dmdirc/events/BaseDisplayableEvent.java

 import com.dmdirc.interfaces.WindowModel;
 
 import java.util.Optional;
-import java.util.concurrent.atomic.AtomicReference;
 
 /**
  * Base class for miscallenous displayable events.
  */
 public abstract class BaseDisplayableEvent extends DMDircEvent implements DisplayableEvent {
 
-    /** The display format to use for this event. */
-    private final AtomicReference<String> displayFormatRef = new AtomicReference<>("");
     /** The properties associated with this event. */
     private final DisplayPropertyMap properties = new DisplayPropertyMap();
     /** The frame container that caused this event. */
         this.source = source;
     }
 
-    @Override
-    public String getDisplayFormat() {
-        return displayFormatRef.get();
-    }
-
-    @Override
-    public void setDisplayFormat(final String format) {
-        displayFormatRef.set(format);
-    }
-
     @Override
     public <T> void setDisplayProperty(final DisplayProperty<T> property, final T value) {
         properties.put(property, value);

src/com/dmdirc/events/ChannelDisplayableEvent.java

 import com.dmdirc.interfaces.WindowModel;
 
 import java.util.Optional;
-import java.util.concurrent.atomic.AtomicReference;
 
 /**
  * Base type for displayable events that occur in channels.
  */
 public abstract class ChannelDisplayableEvent extends ChannelEvent implements DisplayableEvent {
 
-    /** The display format to use for this event. */
-    private final AtomicReference<String> displayFormatRef = new AtomicReference<>("");
     /** The properties associated with this event. */
     private final DisplayPropertyMap properties = new DisplayPropertyMap();
 
         super(channel);
     }
 
-    @Override
-    public String getDisplayFormat() {
-        return displayFormatRef.get();
-    }
-
-    @Override
-    public void setDisplayFormat(final String format) {
-        displayFormatRef.set(format);
-    }
-
     @Override
     public <T> void setDisplayProperty(final DisplayProperty<T> property, final T value) {
         properties.put(property, value);

src/com/dmdirc/events/DisplayableEvent.java

  */
 public interface DisplayableEvent {
 
-    /**
-     * Gets the format name that will be used to display the event.
-     *
-     * @return The format name to use for the event.
-     */
-    String getDisplayFormat();
-
-    /**
-     * Sets the format name that should be used to display the event.
-     *
-     * @param format The format name to use for the event.
-     */
-    void setDisplayFormat(String format);
-
     /**
      * Sets a property relating to how this event should be displayed.
      *

src/com/dmdirc/events/QueryDisplayableEvent.java

 import com.dmdirc.interfaces.WindowModel;
 
 import java.util.Optional;
-import java.util.concurrent.atomic.AtomicReference;
 
 /**
  * Base type for displayable events that occur in queries.
  */
-public abstract class QueryDisplayableEvent extends QueryEvent implements
-        DisplayableEvent {
+public abstract class QueryDisplayableEvent extends QueryEvent implements DisplayableEvent {
 
-    /** The display format to use for this event. */
-    private final AtomicReference<String> displayFormatRef = new AtomicReference<>("");
     /** The properties associated with this event. */
     private final DisplayPropertyMap properties = new DisplayPropertyMap();
 
         super(query);
     }
 
-    @Override
-    public String getDisplayFormat() {
-        return displayFormatRef.get();
-    }
-
-    @Override
-    public void setDisplayFormat(final String format) {
-        displayFormatRef.set(format);
-    }
-
     @Override
     public <T> void setDisplayProperty(final DisplayProperty<T> property, final T value) {
         properties.put(property, value);

src/com/dmdirc/events/ServerDisplayableEvent.java

 import com.dmdirc.interfaces.WindowModel;
 
 import java.util.Optional;
-import java.util.concurrent.atomic.AtomicReference;
 
 
 /**
  */
 public abstract class ServerDisplayableEvent extends ServerEvent implements DisplayableEvent {
 
-    /** The display format to use for this event. */
-    private final AtomicReference<String> displayFormatRef = new AtomicReference<>("");
     /** The properties associated with this event. */
     private final DisplayPropertyMap properties = new DisplayPropertyMap();
 
         super(connection);
     }
 
-    @Override
-    public String getDisplayFormat() {
-        return displayFormatRef.get();
-    }
-
-    @Override
-    public void setDisplayFormat(final String format) {
-        displayFormatRef.set(format);
-    }
-
     @Override
     public <T> void setDisplayProperty(final DisplayProperty<T> property, final T value) {
         properties.put(property, value);

src/com/dmdirc/events/UnknownCommandEvent.java

 import com.dmdirc.interfaces.WindowModel;
 
 import java.util.Optional;
-import java.util.concurrent.atomic.AtomicReference;
 
 import javax.annotation.Nullable;
 
  */
 public class UnknownCommandEvent extends DMDircEvent implements DisplayableEvent {
 
-    /** The display format to use for this event. */
-    private final AtomicReference<String> displayFormatRef = new AtomicReference<>("");
     /** The properties associated with this event. */
     private final DisplayPropertyMap properties = new DisplayPropertyMap();
     @Nullable private final WindowModel source;
         return arguments;
     }
 
-    @Override
-    public String getDisplayFormat() {
-        return displayFormatRef.get();
-    }
-
-    @Override
-    public void setDisplayFormat(final String format) {
-        displayFormatRef.set(format);
-    }
-
     @Override
     public <T> void setDisplayProperty(final DisplayProperty<T> property, final T value) {
         properties.put(property, value);

src/com/dmdirc/util/EventUtils.java

 
 package com.dmdirc.util;
 
-import com.dmdirc.DMDircMBassador;
-import com.dmdirc.events.DMDircEvent;
 import com.dmdirc.events.DisplayableEvent;
 
 /**
     private EventUtils() {
     }
 
-    /**
-     * Posts a displayable event to the bus, and returns the updated display format.
-     *
-     * @param <T>             The type of event to be displayed
-     *
-     * @param eventBus      The bus to post events to.
-     * @param event         The event to be posted.
-     * @param displayFormat The initial, default, display format.
-     *
-     * @return The event's display format after it has been posted on the event bus.
-     */
-    public static <T extends DMDircEvent & DisplayableEvent> String postDisplayable(
-            final DMDircMBassador eventBus,
-            final T event,
-            final String displayFormat) {
-        event.setDisplayFormat(displayFormat);
-        eventBus.publish(event);
-        return event.getDisplayFormat();
-    }
-
 }