Issue #750

This is for the interfaces/trivial implementation classes that
DMDirc plugins can interact with. Eventually plugins will build
against the API instead of the DMDirc client itself, which will
allow for remote/detachable clients (amongst other things).

Change-Id: I1d093931d43021ac56398a5ed8c173ed7439f740
Reviewed-on: http://gerrit.dmdirc.com/4063
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

Force project name to 'dmdirc'. Think this was the cause of all
the nonsense.

Also add plugins in the root project, so gradle knows about all
of them (for tests etc).

Change-Id: Ic828cabe97040d2ba6cae9336392525ee6bad47c
Reviewed-on: http://gerrit.dmdirc.com/3934
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

Change-Id: If8f1b3f0e2df28cfa008e604ed045e186a6b1561
Reviewed-on: http://gerrit.dmdirc.com/3852
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>