Sp3 Rename v3.0.0

The intent of this release is mainly a code simplification which, for the Python geeks out there, also includes comments on what each line does and what each operation does, however it does have its own QoL additions too.

IMPORTANT: This release includes a "4.2" version and a "pre-4.2" version. There is virtually no difference between the two in functionality, other than the Blender version requirement. "pre-4.2" can be installed for any Blender version and "4.2" is for Blender 4.2 and newer to support the new Extensions platform in case Legacy Add-ons are going to be removed.

Additionally, it is highly advised to remove any previous version of the addon if already installed.

• Redesigned viewport panel: The separate "Splat 2" and "Splat 3" buttons are now condensed into a game selector and two buttons, which makes the panel more compact and more straightforward to use.
  
• Simplified code: The code has been reviewed thoroughly (and commented if you want to read through it yourself) as now it's all under a single file operation. For 4.2, there's __init__.py and rename.py, and for pre-4.2, there's the sole __init__.py file - regardless of version, the code and comments are at under 400 lines!
• Added multiselect support for fixing multiple gear items
• "Fix Clothes" will no longer add an excessive amount of Vertex Weight Mix modifiers
• "Fix Clothes" will no longer clear parent relations to any armature

Known issues

• Multiselect is supported, meaning you can fix the Vertex Groups of multiple gear objects at the same time instead of having to do them one by one, but due to some code-related road blocks, the selections have to be done in a specific order.