An animation that plays when a Wither is spawning

YOU NEED GECKOLIB
This mod adds an animation after a Wither altar has been built, to make players feel more involved in the game and actually feel that a Boss Battle is about to come, instead of the boring, usual, immediate spawn of the Wither, that makes it feel useless.
(You can disable the animation with the command: "/gamerule witherSpawnAnimation false" but this won't take effect on already built altars)
Important:
-This mod is NOT compatible with "Wither Spawn Fix", but if you still want both the spawn animation and the spawn fix you can install "Wither Spawn Fix W.S.A. Compatible"
Works with Cracker's Wither Storm Mod too!
Wither Spawn Fix W.S.A. Compatible
Excalibur resource pack compatibility! (by Ruseky)
Also try Golem Spawn Animation!
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