Added Player acceleration/deceleration.

Player now slides and has limited control when airborne.
Merge branch 'master' of https://github.com/Chocolancer/techpro2

Conflicts:
	dagame/src/States/IAG_GameLevelState.as
Merge branch 'master' of https://github.com/Chocolancer/techpro2

Conflicts:
	dagame/src/States/IAG_GameLevelState.as
	dagame/tilemaps/testtile.txt