Deprecate TabCompletionMatches.

Make it extend a list instead of wrapping it, so we can just replace
all usages with... an actual list.

Extract interface for CommandParser

Add interface for UnreadStatusManager.

Make Command an interface

Rename Command to BaseCommand.

Flip BaseCommand and Command around so everything still works.

Command will eventually become an interface when all usages have been replaced

Move some classes to API

Extract an interface for Styliser.

Remove deprecated styliser methods.

Move static styliser methods to new class.

Minor style fixes

The styliser needs an interface extracting into the API, and
we don't really want huge static methods defined on that.

Use PrivateChat in events, not Query.

Use new config annotations.

Fix test deprecations.

Add config annotations to API.

Add dummy version.config.

This allows running DMDirc from IDEA, which seems useful.

Running a normal build just replaces the file in the build output.

At present anything requesting the global config has to depend on
ClientModule, which won't necessarily be exposed through the API.

Move @GlobalConfig, @AddonConfig and @UserConfig to top level
classes in API, and provide both versions of them for now.

Update dependencies

Mockito now errors if a mock is unnecessary, plus a few other minor
API changes.

Update gradle to 3.1.

Move IRC control codes to their own class.

Some other minor tidying to Styliser.

Extract interfaces for BackBuffer and IRCDocument.

More interface/API work.

Rename the private implementation to ConfigBinderImpl, and
make ConfigBinder itself an interface.

ConfigProviderListeners aren't public.