Puzzle 1.5.1 - 1.20 & Fixes

- Update to 1.20
- Fix version string behaving weirdly with ModMenu installed
- Integration for CEM replaced with EMF

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

@@ -3,8 +3,7 @@
   "package": "net.puzzlemc.gui.mixin",
   "compatibilityLevel": "JAVA_17",
   "client": [
-    "MixinOptionsScreen",
-    "CemConfigAccessor"
+    "MixinOptionsScreen"
   ],
   "injectors": {
     "defaultRequire": 1