Update to 1.20

- Remove some devenv mods that are not updated yet
 - Replace lib39 with fletchingtable for automixins
 - Use non kotlin entrypoints
 - Make use of DrawContext in a bunch of places

src/main/resources/fabric.mod.json

@@ -20,17 +20,11 @@
   "icon": "assets/firmament/icon.png",
   "environment": "client",
   "entrypoints": {
-    "main": [
-      {
-        "adapter": "kotlin",
-        "value": "moe.nea.firmament.Firmament"
-      }
-    ],
+      "main": [
+          "moe.nea.firmament.Firmament::onInitialize"
+      ],
       "client": [
-          {
-              "adapter": "kotlin",
-              "value": "moe.nea.firmament.Firmament"
-          }
+          "moe.nea.firmament.Firmament::onClientInitialize"
       ],
       "rei_client": [
           "moe.nea.firmament.rei.FirmamentReiPlugin"

src/main/resources/firmament.mixins.json

@@ -2,7 +2,7 @@
   "required": true,
   "plugin": "moe.nea.firmament.init.MixinPlugin",
   "package": "moe.nea.firmament.mixins",
-  "compatibilityLevel": "JAVA_16",
+  "compatibilityLevel": "JAVA_17",
   "injectors": {
     "defaultRequire": 1
   }