[ENHANCEMENT] Improved offsets for BF and GF animations

[CEliuxJV]

Associated Funkin PR

Divided into parts of #79
Part 1: Current
Part 2: #238
Part 3: #239

Linked Issues

One issue that I mentioned in FunkinCrew/Funkin/issues/3105

Description

1. Improved almost all offsets for each BF and GF animation (except those using spritemaps)

2. Changed the order of some animations in the .json files to make it a little more intuitive. It follows this order:

   • Idle/dance
   • Sing
   • Sing miss
   • Sing-alts (alt, censor, etc.)
   • Hey, cheer
   • Other animations during songs
   • Death animations
   • Cutscene animations

3. Added "hit-hold" to bf-car.json

4. Added "hey" to bf-christmas.json

5. Removed "singUP" from gf-pixel.json, an unused animation that was probably added by mistake

6. Removed a possibly unintentional "singUP" animation that had "prefix": "BF Dies with GF" in bf-holding-gf.json

I used the foot that was pointing towards the camera in the idle animation as a reference in most animations, in others I used the other one.
If you notice any errors or changes you don't like, let me know so I can change them.

Screenshots/Videos

Video showing most of the offsets improvements for the characters:
https://youtu.be/KMfvUnbRmwQ