SRB2 2.2 - Sonic (MD2) with Super Sonic / NiGHTS animations
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Install
1. Copy the folder  models/PLAY  into your SRB2 2.2 "models" folder.
2. Open models.dat (main SRB2 folder, NOT inside models/). Replace the existing
   line that starts with "SONIC " with the line from the included models.dat:
       SONIC PLAY/SONIC.md2 3.0 0.0
3. OpenGL renderer, gr_models On (gr_modelinterpolation optional).

Tweaks
- Too big/small: change 3.0 in the models.dat line.
- Sits too high/low or off-centre: change the 0.0 offset.

Animation names (2.2 style: SPR2_xxxx / SUPERxxxx)
Normal : STND WALK RUN_ ROLL SPNG FALL EDGE PAIN DEAD RIDE TRNS
Super  : STND WALK RUN_ ROLL SPNG FALL EDGE PAIN DEAD RIDE FLT_
NiGHTS : NFLY NDRL NSTD NFLT
Anything not listed falls back to the game's normal defaults (e.g. WAIT -> STND).
Super form is recoloured by SONIC_blend.png automatically.
