build: Add include_fabric and include_forge property

Author: BlayTheNinth

gradle.properties

@@ -52,4 +52,7 @@ unbreakables_version=20.1.3-SNAPSHOT
 
 # Gradle
 org.gradle.jvmargs=-Xmx3G
-org.gradle.daemon=false
+org.gradle.daemon=false
+
+include_forge=true
+include_fabric=true

settings.gradle

@@ -12,4 +12,10 @@ pluginManagement {
     }
 }
 
-include("common", "fabric", "forge")
+include("common")
+if (include_fabric) {
+    include("fabric")
+}
+if (include_forge) {
+    include("forge")
+}