New property "include_mod" to make sure mods work alongside coremods

build.gradle

@@ -103,6 +103,9 @@ jar {
 		def attribute_map = [:]
 		if (project.use_coremod.toBoolean()) {
 			attribute_map['FMLCorePlugin'] = project.coremod_plugin_class_name
+			if (project.include_mod.toBoolean()) {
+				attribute_map['FMLCorePluginContainsFMLMod'] = true
+			}
 		}
 		if (project.use_mixins.toBoolean()) {
 			attribute_map['TweakClass'] = 'org.spongepowered.asm.launch.MixinTweaker'

gradle.properties

@@ -15,4 +15,5 @@ use_coremod = false
 use_assetmover = false
 
 # Coremod Arguments
+include_mod = true
 coremod_plugin_class_name =