Reduce duplicate code (#18)

* Reduce duplicate code

* Fix gradle task name

* Revert name changes

* Revert action name

* Cleanup

* Revert to java 17

* Fix generation

* Cleanup

* Simplify code of DGU

* Remove unnecessary annotations

* Remove unused var

* Halt with error on error

* Remove unused mixins

* Update fabric loader

* Ignore success result

* Update gradle and use merged jar

* Implement new client and server merged environment for running fabric

* Set server run dir as asset dir

* More cleanup

* More cleanup 2

* More improvements

* Remove more duplicate code

* Use newer java methods

* More cleanup

* Remove SoundAccessors

* More cleanup

* Use java 21 for build

* Initial work on 1.20.5

* Cleanup a lot of stuff

* Do not generate mod jars to speed up builds

* Override merger on now open classes directly

* Use recommended approach

* Readd custom merger

* Working materials data generator

* Fix inconsistencies

* Fix collision order to be random

* Use LinkedHashMap for more reproducibility

* Fix imports

1.20.5/src/main/resources/minecraft-data-generator.mixins.json

@@ -0,0 +1,15 @@
+{
+  "required": true,
+  "minVersion": "0.8",
+  "package": "dev.u9g.minecraftdatagenerator.mixin",
+  "compatibilityLevel": "JAVA_17",
+  "mixins": [
+    "EULAMixin",
+    "ReadyMixin"
+  ],
+  "client": [
+  ],
+  "injectors": {
+    "defaultRequire": 1
+  }
+}