Support for pausing #91
Description
Both in DAP mode (with the pause button) and in Cli mode (with ctrl-c, like in gdb) one should be able to suspend the running program and yield to the debugger.
Off the top of my head it sounds like to do this we have to convince the scheduler to stop at the next consistent state once "Pause" is requested. Likely this means some global toggle which at the next consistent state unblocks the debugger thread and blocks the program execution until the debugger resumes.