* Make cleanup a little more robust to mitigate undefined behavior
- Add some null checks before cleaning up the GPU3D renderer
- Make sure that all deleted objects are null
- Move cleanup logic out of an assert call
- Note that deleting a null pointer is a no-op, so there's no need to check for null beforehand
- Use RAII for GLCompositor instead of Init/DeInit methods
* Replace a DeInit call that I missed
* Make ARMJIT_Memory less likely to generate errors
- Set FastMem7/9Start to nullptr at the end
- Only close and unmap the file if it's initialized
* Make Renderer3D manage its resources with RAII
* Don't try to deallocate frontend resources that aren't loaded
* Make ARMJIT_Memory::DeInit more robust on the Switch
* Reset MemoryFile on Windows to INVALID_HANDLE_VALUE, not nullptr
- There is a difference
* Don't explicitly store a Valid state in GLCompositor or the 3D renderers
- Instead, create them with static methods while making the actual constructors private
* Make initialization of OpenGL resources fail if OpenGL isn't loaded
* assert that OpenGL is loaded instead of returning failure
