Use consistent names for rendering matrices.

- setInverseCameraMatrix(...) -> setMatrix_cameraToWorld
- getCameraMatrix() -> getMatrix_worldToCamera
- getInverseCameraMatrix() -> getMatrix_cameraToWorld
- mult/pop/push/setMatrix ->  mult/pop/push/setMatrix_modelToCamera
- get/pop/push/setProjectionMatrix ->  get/pop/push/setMatrix_cameraToClip
- Add pushAndSetMatrix_modelToCamera(...)
- Add pushAndSetMatrix_cameraToClip(...)
Rename matrix uniforms (keep old ones for backward compatibility)

- sg_modelViewMatrix -> sg_matrix_modelToCamera
- sg_projectionMatrix -> sg_matrix_cameraToClip
- sg_modelViewProjectionMatrix -> sg_matrix_modelToClip
- sg_cameraMatrix -> sg_matrix_worldToCamera
- sg_cameraInverseMatrix -> sg_matrix_cameraToWorld
RenderingContext/RenderingParameters: Remove superfluous 4th value for lighting parameters.