[Open Assets] Egg FrostBurn v2.1

Probably a successful try to port the boss Egg FrostBurn, previously known as such mods like "The Emerald Isles", "Boss Mayhem" and "Zeno's Pack".
If you find bugs - let me know about them.

Egg Frostburn for SRB2 2.1: https://mb.srb2.org/showthread.php?t=41965

Supporters / Co-Authors:

• Jimita
• Nev3r
• Prisima
• Sapheros