Alpha 2

Glyph Alpha 2 Update. This branch is for Unity Source Code. Check the
other branches for the compiled game.

Additions:
+ Energy Fountains
+ Gameplay Progression
+ Music
+ Splash Text
+ In-game settings
+ Insane Game Mode [see bugs]

Changes:
- Changed recharge rates
- Most menus are navigable with the keyboard
- Previous settings window is now only shown while pressing shift and
launching Glyph

Removals:
- Removed FPS meter

Bugs:
- Framerates drop dramatically with many enemies on screen
- Insane Mode is not a bug, but should be avoided on older systems.