refactor: use submodules

platforms/allay/build.gradle.kts

@@ -4,4 +4,23 @@ dependencies {
     implementation("com.google.code.gson", "gson", Versions.Allay.gson)
 
     compileOnly("org.allaymc.allay", "api", Versions.Allay.api)
+}
+
+tasks.register<Copy>("copyMappings") {
+    from("src/main/resources/mappings") {
+        include("biomes.json", "items.json")
+    }
+    from("src/main/resources/mappings-generator") {
+        include("generator_blocks.json")
+        rename("generator_blocks.json", "blocks.json")
+    }
+    into("src/main/resources/mapping")
+}
+
+tasks.processResources {
+    dependsOn("copyMappings")
+
+    exclude("mapping/.keep")
+    exclude("mappings/**")
+    exclude("mappings-generator/**")
 }