Puzzle 2.0.0 - Fabric 1.21

Puzzle v2.0.0+1.21 for 1.21

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Puzzle 2.0.0 - Multiplatform & Cleaner code

Removed intrusive branding (previously visible on Title screen and F3 menu)
De-modularized: Previously, Puzzle was split into multiple modules which complicated the development process and was just unnecessary
Experimental NeoForge support
Many small improvements
puzzle-splashscreen: Improved background image blending
puzzle-splashscreen: Added support for custom blend functions for full OptiFine parity