Added header descriptions for Consts classes
Player is drawn atop of bullets
Enemy count displayed on screen
Allowed for enemies to have 0 vel on either axis
Merge branch 'dev' of github.com:terrehbyte/ZombieRoids into feature-terry
Life gain and bug fixes

- Gain a life every 10000 points
- Fixed fragment size bug
- Finally got initial spawn velocity to always aim inward
Added enemies count to GameConsts and its XML file
Merged 'feature-terry' into 'dev'
Merging from dev