Armature Rename
Changes the location of the side differentiator (L/R) in a bone's name to be placed at end of it temporarily, allowing Blender to detect bones as pairs and make symmetry options work, like weight painting symmetry (Do not use pose symmetry as it'll mess with the bone's roll value and break animations), making it faster to create compatible custom models. After you're done weight painting you can restore the original names and all the weight painting will remain on both sides. Don't forget to restore it or the character's limbs will remain static in game.
Only standard armature bones as well as helper bones will be renamed, any other bone type will remain the same to avoid causing unrecoverable changes.
This function is not needed with S&Box or Team Fortress 2 armatures as their side differentiators are already at the end of the bone name, so it's disabled for those armatures.