Split ActiveFrameManager out of MainFrame

Use selection events to change windows.

Switch to seperate class for Swing event bus.

Tidying

Tidy.

Fix compile error.

Change optionals.

Tell gradle to use 1.8.

Fix pulling pull requests.

Switch CI to j8

Annoying Circle CI changes.

Add fake jar/test tasks with dependencies on the subprojects.
Make dependencies depend on subprojects.

Build meta, not just plugins.
Expose plugins as artifacts.

Fixes DMDirc/Infrastructure#62

Remove StatusBar

Switch to events for statusbar messages.

Switch to events for status bar messages.

Fix the status bar.

This needs to be fixed properly by removed the statusbar
manager and all uses.

Don't get a PluginManager from random places.

More highlight tidying.

Tidy up highlight calculation.

Use the bounds from the logical highlight shape, rather than
calculating everything from scratch using the text metrics.

Use floats for highlight shapes.

This doesn't help fix anything, but truncating everything to
integers is odd.