fix hackish stack frame check while splitting segment.

[kianzarrin]

• Removed the code that looks for stack frame.
• instead I patch the methods we are looking for with prefix/postfix modifying a static bool Called variable.
• In such patches I return silently when thread is not simulation thread. this helps with thread safety.
• NetToolCreateNode0Patch patches the called of NetToolCreateNodePatch and hence the 0 in the name. unlike NetToolCreateNodePatch NetToolCreate0NodePatch it is not called by "LoadPaths".

Notes:

• there are multiple choices of where to assign segmentID and where to release segment skin. I could do it in prefix/postfixes I added or I could do it in Create/ReleaseSegment patches.
• each call to MoveMiddleNode releases 1 segment and may create 1 segment ... no more.
• each call to SplitSegment() releases no more than one segment (not including the ones by MoveMiddleNode).

[kianzarrin]

I changed the code a little bit because I think it was a bit hackish.

[kianzarrin]

@boformer would you consider merging this? I resolved the merge conflicts.