Fixes #3027

- Ditch slf4j in favor of log4j. slf4j is (unfortunately) very much unmaintained at this time and future versions of MC (1.17+) will use log4j version 2.14.1 onwards over some ancient sfl4j version.
- Using log4j reduces our jar size as well, because we don't need to bridge it as the game provides it natively.

Core/build.gradle.kts

@@ -39,9 +39,7 @@ dependencies {
     testImplementation(libs.worldeditCore)
 
     // Logging
-    api(libs.slf4j)
-    runtimeOnly(libs.log4j) {
-        exclude(group = "org.slf4j")
+    compileOnlyApi(libs.log4j) {
         because("Minecraft uses 2.8.1")
     }