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

build.gradle

@@ -1,4 +1,20 @@
 allprojects {
     version = "1.0.0-SNAPSHOT"
     group = "dev.u9g"
+
+    repositories {
+        maven {
+            name = "wagyourtail releases"
+            url = "https://maven.wagyourtail.xyz/releases"
+        }
+        maven {
+            name = "legacyfabric"
+            url = "https://maven.legacyfabric.net/"
+        }
+        maven {
+            name = "fabric"
+            url = "https://maven.fabricmc.net/"
+        }
+        mavenCentral()
+    }
 }