[sys.monitoring] Tracing execution flow

[int19h]

This covers all logic related to execution flow: stack trace, stepping, breakpoints, exceptions etc.

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1. [sys.monitoring] Stack tracing #1421
   4 of 4
   enhancement +1
2. [sys.monitoring] Stepping #1424
   4 of 4
   enhancement +1
3. [sys.monitoring] Breakpoints #1429
   9 of 9
   enhancement +1
4. [sys.monitoring] Exception breakpoints #1436
   4 of 4
   enhancement +1
5. [sys.monitoring] Report loaded modules #1472
   enhancement +1
6. [sys.monitoring] Deadlocks when breakpoints are hit #1510
   bug +1
   

[judej]

shelving work for sys.monitoring implmentation for now