Synchronize ftrack hierarchical and shot attributes

[iLLiCiTiT]

Push attributes event handler now works slightly different. Pushing attribute values from pype's hierachical to not hierarchical for ftrack expressions has more features in.

Changes

• there is no more mapping From attribute key -> To attribute key but only defined attribute keys that will be updated
  • attribute values are synchronized both ways hierarchical <-> not hierarchical
• by default it works only for keys frameStart and frameEnd and entity type Shot but it should work for all of them (just change attributes)

How to test

• create frameStart custom attribute for entity type Shot (must have same attributes: non-decimal number)
• run event server
• change value in hierarchical attribute on Shot entity -> check if was value was also changed in the new attribute
• change value in the new attribute on Shot entity -> check if was value was also changed in hierarchical attribute

Ftrack default attributes fend and fstart can be renamed.