Convert all durations (execpt animations) to use 'ms' or 's'
Use millisecond durations for fantasycore/alpha_demo animations
Use millisecond timing for devlab and minicore animations
Merge pull request #426 from dorkster/60fps

Use millisecond timing in game data
Remove enemygroup layer from maps

All enemies are now located in the enemy layer.
Merge pull request #427 from dorkster/enemy

Remove enemygroup layer from maps