Tilesets

Created by: VLanvin

Features :

• Added rendertextures, framebuffers, renderbuffers, etc...
• Added mipmaps
• Reworked most of the architecture of the project

Notes :

• Tilesets are not implemented (any implementation would be too restrictive)
• Batch drawing might be implemented in a future branch.
• Sprite drawing will also be improved in the future.