Display of variables

[ncannasse]

It would be nice to be able to display a value on screen using the debugger.

• we would need to pause the debugger
• then use $disp(expr) as a watch expression
• this would store the variable info into the VM
• the app would be able to retrieve which vars are displayed and show them onscreen, and update them each frame

A simpler version would be $trace(variable), which would put a watch break on variable change, then trace it after each change in stdout and resume the process. That would give one trace per change (no need for game/app support)