[ENHANCEMENT] Improved offsets for the Pico gang characters

[CEliuxJV]

Associated Funkin PR

Divided into parts of #79
Part 1: #237
Part 2: Current
Part 3: #239

Linked Issues

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

Description

1. Improved almost all offsets for Pico, Darnell, Nene, and Otis (except for 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. Fixed pico-dark.json sing-miss animations because the prefixes were causing it to use pico-playable animations.
4. Removed from nene-tankmen.json "hairBlowing" animations because they probably won't be used in week 7.

Potential changes I didn't make in case they break something:

1. Remove "firstDeathExplosion" from pico-playable.json because it has a prefix: "Pico Idle Dance".
2. Remove "firstDeath" from pico-holding-nene.json because it's an animation with just an empty prefix, so it plays all its animations.

I used the foot that was pointing towards the camera in the idle animation as a reference in most animations, in others (like pico.json "singUP") 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