Added
- TextureCube class and Context `texture_cube` method
- Context `enable_only` method
Changed
- Enable flags support bitwise `__or__`, `__and__` and `__inv__`
- Framebuffer does not create a Renderbuffer when the depth_attachment is None
Removed
- `ModernGL.MULTISAMPLE` constant
- Version class and Version constants
Fixed
- Texture3D created with wrong type