occlusion 1st version

NOK : problem with textures
it's working ! each...
occlusion texture 1st version OK

corners is missing
get texture coord is easier now !

texture atlas managed with getCoordText now
occlusion working with 1 texture
merge physics in occlusion texture
Occlusion + Texture working
update physics
Merge branch 'occlusion_texture' of https://github.com/ouiBonsoirTeam/iMineCraft into occlusion_texture
new texture
collisions ! (not perfect)
Merge branch 'occlusion_texture' of https://github.com/ouiBonsoirTeam/iMineCraft into occlusion_texture
1st version of occlusion on all sides

seems to be ok for front/back/top, but not for left and right
bottom not tested
vertical inertia (vely niiice) + fps limiter (not working good)
occlusion texture final working
Merge branch 'occlusion_texture' of https://github.com/ouiBonsoirTeam/iMineCraft into occlusion_texture
Merge pull request #4 from ouiBonsoirTeam/occlusion_texture

mergin occlusion texture into voxel_texture