Many QoL improvements & Resourcepack features

- Support Sodium 0.6+
- Allow resourcepacks to force culling and hide fully-encircled leaf blocks
- Force leaf culling when the smart leaves pack is enabled
- Reload world when the config changes
- Only apply Sodium mixins when Sodium is actually installed (Removes log spam)

fabric/src/main/resources/fabric.mod.json

@@ -27,13 +27,14 @@
 
   "depends": {
     "midnightlib": "*",
-    "minecraft": ">=1.19.3"
+    "minecraft": ">=1.21"
   },
   "breaks": {
-    "sodium": "<0.4.9"
+    "sodium": "<0.6.0"
   },
 
   "mixins": [
-    "cullleaves.mixins.json"
+    "cullleaves.mixins.json",
+    "cullleaves-fabric.mixins.json"
   ]
 }