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

common/src/main/resources/puzzle-gui.mixins.json

@@ -0,0 +1,11 @@
+{
+  "required": true,
+  "package": "net.puzzlemc.gui.mixin",
+  "compatibilityLevel": "JAVA_17",
+  "client": [
+    "MixinOptionsScreen"
+  ],
+  "injectors": {
+    "defaultRequire": 1
+  }
+}