RE: Thread timing and Demo #6

I've implemented and tested a "cost" system that estimates the time cost of running sequences of code between conditional entry/exit points. At the end of each sequence the time cost is added to an accumulative time cost. If that accumulative time cost is greater that a threshold value it performs a C++ Sleep(1); statement which gives other threads a chance to get things done. I've also added a Sleep(0); statement inside INKEY$ however with the previous improvement it is probably superfluous.

My current goals for Demo #6 are:
Fix all reported bugs in Demo #5
Implement user defined SUBS/FUNCTIONS
Add support for missed internal subs/functions like DRAW etc.