Fallout Mash-up Pack Release 1

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added 1.21 textures
added music
added hanging sign UI textures
added creative gui texture (1.7.3)
added new paintings
added Legacy Skins ui support
added Fallout skins for Legacy Skins
added spyglass model texture (handmade since i couldn't find the official one)
added Fallout Edition logo
added title_text and stage_text to common_colors.json (1.7.3)
added menu background (1.7.3)
added (incomplete) Simple Voice Chat support
fixed missing beacon_check icon
fixed fallout world saving as pack instead of Fallout World in .Minecraft/saves
fixed all broken entities (except glow squid)
fixed nether in world