Removed old Spinner creation method from the Screen.
Fixes to a few runtime crashes in the UI system.
Fixed a large quantity of runtime bugs found while updating the Catch UI to the new system as well as minor usability enhancements and code styling fixes.
Removed some needless code.
Updated Catch so it can launch without crashing (with the updated archives), and gave it the exit button and confirmation.
Merge branch 'master' of github.com:BlackToppStudios/Mezzanine