Prefix base/head/portrait StatBlock vars with 'gfx_'
Create enum for base stats and define internal stat names
Fix multiple enemy spawns on one tile
Refactor StatBlock to use STAT enum
Show some per_* stats in MenuCharacter tooltips
Add warning if not all enemies of an enemygroup could be spawned
Merge pull request #674 from stefanbeller/master

Don't spawn multiple enemies on one tile
Merge pull request #675 from dorkster/statblock

Statblock refactoring