feat(mods/MonsterGirls): Add bunny-girl mutation category

[RobbieNeko]

Purpose of change (The Why)

After #5885, the mod needs to be updated for proper compatibility and also in order to have the new mutation path!

Describe the solution (The How)

Adds the bunnygirl mutation path based on the vanilla Rabbit path

Describe alternatives you've considered

• Give them the nose and maybe the paws

Current design choices led me to decide against it, but could very well be done if desired

Testing

I used my scripts and looked over the changes in github desktop to make sure they all looked right.

Additional context

I've started to realize that the Kemonomimi names are kinda weird to have for the most part, and if I'm already calling them "X-girl" in the IDs then it would be sensible enough to just go on ahead and change their displayed names in-game too. So that might be a nice small future PR, if it's decided to be a good enough idea.

Checklist

Mandatory

• I wrote the PR title in conventional commit format.
• I ran the code formatter.
• I linked any relevant issues using github keyword syntax like closes #1234 in Summary of the PR so it can be closed automatically.
• I've committed my changes to new branch that isn't main so it won't cause conflict when updating main branch later.

[chaosvolt]

bnuuy