Fix issues with extracting plugins

Tell the plugin system that a plugin has been updated when we
extract it from within the jar. This forces it to get a new
resource manager, prevenint it from using the stale one.

Fixes CLIENT-184

Change-Id: I93bd2f705baf1ccd34b2ba3a6db107b694690ea4
Reviewed-on: http://gerrit.dmdirc.com/1809
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>

src/com/dmdirc/Main.java

                         resourceName.length()));
 
                 if (!newFile.isDirectory()) {
+                    final PluginManager pm = PluginManager.getPluginManager();
+
                     ResourceManager.getResourceManager().
                             resourceToFile(resource.getValue(), newFile);
+
+                    final PluginInfo plugin = pm.getPluginInfo(newFile
+                            .getAbsolutePath().substring(pm.getDirectory().length()));
+
+                    if (plugin != null) {
+                        plugin.pluginUpdated();
+                    }
                 }
             } catch (IOException ex) {
                 Logger.userError(ErrorLevel.LOW, "Failed to extract plugins", ex);