Implement better GPU debugging

[Amjad50]

Several things we can add to improve gpu debugging and help for example fix #7 .

• Ability to clock one gpu frame at a time.
• Store the draw commands for a frame, and allow to reply.
• Allow to easily modify the saved commands, so we can know which command results in a rendering bug.
• Would be useful to warn if the command will perform breaking action, for example, if the commands read into RAM and then modify the content. Not sure exactly how this will work, but generally a kind of safety mechanism so that we don't corrupt the gpu/ram memories.