Added AboutApp Panel
- Also connected the different menu panels with the Main Menu.
- Created new prefabs for the individual UI Panels.
- Imported QF License Manager for collecting the individual Licenses. C2
- Made minor changes to the About App, Options Menu and Main Menu
- Menu now accessible during gameplay by pressing "Escape"
- Added CloseUIEventArg, allowing specific panels to close
- Created UI Canvas prefab and added it to the MainScene