Remove hardcoded limit of 4 bone weight influences

[hypermodule]

This PR aims to remove the hardcoded limit of 4 bone weight influences.

I have tested it manually on a few skeletal meshes from a game that use 8 bone weight influences, and it seems to work.

However, I couldn't try out the glTF export, since it seems to be broken on the current master branch (throws a NullReferenceException when exporting)?

[h4lfheart]

looks fire!! i don't think this would work properly with psk though bc the importers are hardcoded to 4 weights afaik so that may need to be looked at before merging

[hypermodule]

looks fire!! i don't think this would work properly with psk though bc the importers are hardcoded to 4 weights afaik so that may need to be looked at before merging

Thank you, half! ❤️ I have tested the change with both io_scene_psk_psa (DarklightGames) and BlenderPSKPSA (Zain), and both of those Blender addons seem to handle the additional influences without issue. 😊

I think the only obstacle to merging this change is that the 4 weight limit is also hardcoded into FModel's animation snooper code. 😿

[h4lfheart]

snooper is probs an easy fix, I'm not too familiar but I don't think it should be terribly hard

also a lot of people probably still use the old psk importer so maybe give that a go too? (https://github.com/Befzz/blender3d_import_psk_psa)

[h4lfheart]

confirmed works with befzz importer and fixes issues with weights on fortnite skins, will merge