Ftrack integrate hierarchy fix

[iLLiCiTiT]

Issue

• integrate hierarchy ftrack plugin in hiero does not use hierarchical custom attributes if there is non hierarchical with same key
• found out there are 2 plugins doing the same (integrate_hierarchy_ftrack.py and integrate_hierarchy_ftrack_SP.py) in plugin for standalone publisher (with _SP suffix) works as should second does not

Changes

• kept only one plugin where hierarchical attributes are handled properly
• there are issues with importing pype's ftrack module in Python 2 hosts so imported constant and function from ftrack module lib was added to the plugin without importing (duplicated code with possible issues in future)

🏴	Pype 3.x PR
pype	#1086