framebuffer fragment inspection

[AODQ]

This will allow images to have individual colors inspected. For real-time only one fragment can be shown, but for non-realtime then each fragment will have a history (writes, discards, etc) that should be visible.

This will mean that multiple image buffers have to be stored in order to track the history. This means that history tracking should have a limit (controllable by user) in order to not consume too much memory.

[AODQ]

a single buffer can be inspected but not its history yet