Collapse loaded paths to AYON project root env vars

[BigRoy]

Changelog Description

Collapse loaded paths to AYON project root env vars

Additional review information

Fix the loader part of #210

Loading assets should now load the paths using e.g. $AYON_PROJECT_ROOT_WORK variable instead of the absolute path making the scene directly cross-OS compatible within AYON.

TODO

• Optimize the logic for collapsing the paths?
• Allow enabling/disabling of the feature

Testing notes:

1. Loading assets should now load the paths using e.g. $AYON_PROJECT_ROOT_WORK variable.
2. Loading should work.
3. Updating loaded containers should work.