Added main menu color skinning

- Fixed the delete button not showing help text
Updated to MooCommands 2.0
Applied a gaussian blur to the game window when it's paused
Started rewriting Entity class

- Fixed .gitignore
Fixed Schematics not loading into Bases

- Fixed a few commands
- Fixed NullPointerException in the Render Manager when exiting the
engine
- Finalized the Entity rewrite
Made the Node class serializable
Started work on post processing stuff