OSX Unity editor library load and support for mesh in quads.#3

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repalash wants to merge 3 commits intoeastskykang:masterfrom

repalash:unity_editor_fixes

Commits on Oct 7, 2020

Support for quad in mesh data and loading library assimp before scene load when using from Unity editor.
repalash
committed
Try initialize Assimp plugin in Unity before every load
repalash
committed
Fix packages editor path
repalash
committed