Create debug GUI

[lukors]

This is to help find issues and verify the program does what it's supposed to. Press ctrl F12 to toggle it.

Since it would be limited by the size of the window it can't show all information that would be useful. More detailed information can be printed to the console with another feature.

It should be a list of text that shows the following:

• [ ] Buffers in RAM: {X} ({Y} MB) How many buffers are in RAM (and how much RAM they take up)
• [ ] Buffers on disk: {X} ({Y} MB) How many buffers are on disk (and how much RAM they take up)
• [ ] Graphs: {} Number of LiveGraphs
• [ ] Nodes: {} Number of Nodes
• [ ] Queued: {} Number of Nodes queued for processing
• [ ] Processing: {} Number of Nodes that are processing (and other states?) out of max
• [ ] FPS: {} Frames per second