This iteration brings the plugin information into a panel at the bottom,
it also changes the enable button into a checkbox.  This has code added
for improvements later on but the UI elements for this commented out.

Issue CLIENT-33

Change-Id: I6835f140b74e6f8e6ab815e6277504a3aaa0ed47
Reviewed-on: http://gerrit.dmdirc.com/2147
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>