add rocket launcher graphic and adjust Sprite origin access
work on arm data loading
unit sprite arm drawing
arm rotation functional
work on weaponsprite
just use 1 weapon for now
WeaponSprite data & placeholder
work on weapon sprites
weapon sprite drawing
weapon sprite drawing
Weapon orientation close to correct.

Just need to express correct hand position rather than using texture
height.
weaponsprite rotation working
projectiles exit muzzle
Arm and weapon move behind/in-front when unit turns
allow enemy sprites to still work
allow cryonades to still work
Merge branch 'weapon-sprites' into dev