Add GraphicManager getInstance() implementation.
Clean SpriteComponent .h and .c
Add not working code.
Use _sSpriteName to init sprite.
Fix bug on static member _pInstance in GraphicManager
Merge branch 'feature/sprite' of https://github.com/synth-game/Synth into feature/sprite
Display a Sprite on screen (0,0)
Set position of the sprite depending on the position of the actor (geometry).
Clean AnimatedSpriteComponent .h and .c
Clean HeroAnimatedSpriteComponent .h and .cpp
Add actor with animatedSpriteComponent.
Add walk animation to the girl.
Add missing underscores.
Clean animation code towards GraphicManager.