Add licences to about model.

Add ability for plugins to add info to the model.

https about dialog URL.

Initial work on a core about dialog model.

Stop ClientInfo being static.

Fix some PMD errors.

Remove some deprecated uses of getConnection().

Update PMD to 5.2.2.

Add a BackBuffer class.

This will move some of the logic out of FrameContainer, and will
be responsible for handling DisplayableEvents in the future.

Update build scripts.

Gradle version bump.

Fix some PMD violations.

Tidy up gradle source sets.

This replaces the default source directories (src/main/java, etc)
with our own, instead of just appending ours to the list.

Re-add manifest to fat jar...

Fix duplicate jar contents.

Don't include the version.config from build as well as the one we're
generating.

Don't include dependencies etc twice in fat jars.

Add save method to LifecycleComponent

Make shutDown just call save by default.

Include DMDirc in the jar...

Apparently this is useful in some cases. I have my doubts.

Add target to bundle plugins in jar.

Building client:fatjar will bundle all plugins in the 'plugin'
configuration in gradle (currently IRC parser, Swing UI, two
tab completers) into a client jar.

Fixes #100

Tidy up/correct build script a bit.

Fix incorrect plugin names.

Move task configuration into the task, rather than referencing it
oddly afterwards.

Don't pre-download dependencies for Circle.