The changes are:
- The shader now is passed as a parameter of the batch `draw` method (batch.draw(shader)). Since the batch always has to set a shader before drawing;
- The batch methods to specify a value to a uniform have been removed. Uniforms are parameters of the program (here called shader). If you change a uniform, it changes in all batchs that use the same program;
- New methods were added to set uniforms by the shader;
- The `batch.program_set_builtin` was removed. It is a duplicate of `program_set` but without a shader object. We need the shader object to configure the uniform;
Differential Revision: https://developer.blender.org/D3752
