[WIP] fix Mixin annotation processing

build.gradle.kts

@@ -3,6 +3,7 @@ plugins {
     id("net.minecraftforge.gradle").version("3.0.157")
     id("org.spongepowered.mixin").version("0.7-SNAPSHOT")
 }
+apply(plugin = "org.spongepowered.mixin")
 
 repositories {
     maven("http://files.minecraftforge.net/maven")
@@ -14,10 +15,13 @@ dependencies {
     "minecraft"("net.minecraftforge:forge:${properties["mcVersion"]}-${properties["forgeVersion"]}")
 
     "implementation"("kottle:Kottle:${properties["kottleVersion"]}")
+
     "implementation"("org.spongepowered:mixin:0.8-SNAPSHOT")
+    annotationProcessor("org.spongepowered:mixin:0.8-SNAPSHOT")
 }
 
 sourceSets {
+    get("main").ext["refMap"] = "betterfoliage.refmap.json"
     get("main").resources.srcDir("src/forge/resources")
     get("main").java.srcDir("src/forge/java")
 }
@@ -25,6 +29,7 @@ kotlin.sourceSets {
     get("main").kotlin.srcDir("src/forge/kotlin")
 }
 
+
 minecraft {
     mappings(properties["mappingsChannel"] as String, properties["mappingsVersion"] as String)
     accessTransformer(file("src/main/resources/META-INF/accesstransformer.cfg"))
@@ -39,10 +44,6 @@ minecraft {
     }
 }
 
-mixin {
-    add(sourceSets["main"], "betterfoliage.refmap.json")
-}
-
 java {
     sourceCompatibility = JavaVersion.VERSION_1_8
     targetCompatibility = JavaVersion.VERSION_1_8

gradle.properties

@@ -1,4 +1,5 @@
 org.gradle.jvmargs=-Xmx2G
+org.gradle.daemon=false
 
 group = com.github.octarine-noise
 jarName = BetterFoliage-Forge