Added the add member panel to the group panel.
Created a new friend selector panel, added it to the group panel, implemented the cancel button and loaded the table with data.
Implemented the add button on the friend selector panel. Implemented the remove button on the group table.
The group filter panel will now just display the group name when the add group panel is showing.
Added listeners to the tables to instantly update the tables when the database is updated.
Cleaned up some test code by removing unneeded tests.
Fixed issues with the different types of table models not getting passed around properly. This caused a nil pointer exception which was hidden by a future without a try-catch block.
Changed the set-table-model and set-table-listeners functions to a single initialize-listeners function in the TableDBListeners.