Reimplement DMScriptWrapper

[miile7]

DMScriptWrapper

Move error handling into the exit function where it belongs to!

Executing script

Keep current idea:

• Wrap all setvars with DMTypes
• Create code by using DMType.getDMCodeDefineVariable()
• Execute Code
  • Add threaded code to be waited for optionally, check out old DMScriptWrapper.getSeparateThreadWaitCode() and bottom of DMScriptWrapper.getExecDMScriptCode()
• Get Value by using DMType.parsePersistentTagGroupValueForPython()