* Added sort filter proxy model for gem model that can filter based on name, gem origin, supported platform, features and/or types.
* Added new filter pane on the left with several filter categories for gem origin, type, platform and feature.
* Added filter category widget which is a collapsable generalized checkbox group that can interact with the proxy model and thus control filtering.
* Removed fixed size of the project manager. The application should always be resizable.
* Forced Project Manager window to 1200x800
* Final look for FirstTimeUseScreen, essentially complete
* Remove margins on screens
* Added License info for image
* Renamed UX screen files and classes to include screen in the name
* Changed screens to emit a screen change request a controller can connect to
* Made ScreensCtrl that owns and manages screens and their changing and history
* Made Project Settings Control managing back and next buttons
* Add Project Setting Model and moved New Project Settings Ui into Screen file
* Goto previous screen always works
* Removed unnecessary QObject namespace from connect calls
* Merged ProjectSettingsModel into ProjectInfo
* Moved Qt files into to renamed 'S'ource
* Updated files after moving all Qt folder into Source
* Updated Source capitalization in cmake files list
* Adding newline to the end of project_manager_files.cmake
Co-authored-by: lumberyard-employee-dm <56135373+lumberyard-employee-dm@users.noreply.github.com>
Benjamin Jillich
Alex Peterson
AMZN-nggieber