Implement label/screenspace text

[hobogenized]

• Switch to free license Caladea font
• Change text example to demonstrate difference between label and text
• Enforce that texture for font exists at same root as font data file
• Change 2d font shader to allow for transforms
• Remove references to models

[acgaudette]

Also @hobogenized there was that screen resize scaling bug.

[hobogenized]

Sounds good. We'll try refactoring in the future.