Fix Link import/export

[Dragorn421]

Fixes some issues introduced by #547 by refactoring a bunch of stuff
Also incidentally fixes removing skeletons when exporting

Help needed for fixing the import of pre-new-assets Link, I get

Traceback (most recent call last):
  File "/home/dragorn421/.var/app/org.blender.Blender/config/blender/4.4/scripts/addons/fast64_gitlinked/fast64_internal/z64/skeleton/operators.py", line 76, in execute
    ootImportSkeletonC(decompPath, importSettings)
  File "/home/dragorn421/.var/app/org.blender.Blender/config/blender/4.4/scripts/addons/fast64_gitlinked/fast64_internal/z64/skeleton/importer/functions.py", line 313, in ootImportSkeletonC
    ootGetObjectPath(isCustomImport, importPath, folderName, False),
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/dragorn421/.var/app/org.blender.Blender/config/blender/4.4/scripts/addons/fast64_gitlinked/fast64_internal/z64/utility.py", line 470, in ootGetObjectPath
    ootGetPath(
  File "/home/dragorn421/.var/app/org.blender.Blender/config/blender/4.4/scripts/addons/fast64_gitlinked/fast64_internal/z64/utility.py", line 507, in ootGetPath
    raise PluginError(path + " does not exist.")
fast64_gitlinked.fast64_internal.utility.PluginError: /home/dragorn421/Documents/oot_prenewassets/./assets/objects/object_link_boy does not exist.

[Yanis002]

oh I completely missed the ready to review, I'll do it soon 👍

[Yanis002]

adult link works fine but child link still have issues apparently:

fast64.fast64_internal.utility.PluginError: Could not find texture "/*
        Note `PLAYER_EYES_RIGHT` corresponds to the "left" eyes texture", so it can not be used in a flipbook texture.
For OOT scenes this may be because the scene's draw config references textures not stored in its scene/room files.
In this case, draw configs that use flipbook textures should only be used for one scene.

also I found a way to not hardcode the enum but it seems a bit redundant with that filepaths.extend line 311 of importer/functions.py

[Yanis002]

it works but I'm concerned about that enum oddity, I just hope it won't come back later 🙏 (tested on decomp and hackeroot)

[Yanis002]

works properly for real (except the collar but this can wait, I think fixing the import itself is more important than fixing one texture not importing properly)