Add mixin extras

src/main/java/moe/nea/firmament/init/MixinPlugin.java

@@ -18,6 +18,7 @@
 
 package moe.nea.firmament.init;
 
+import com.llamalad7.mixinextras.MixinExtrasBootstrap;
 import org.objectweb.asm.tree.ClassNode;
 import org.spongepowered.asm.mixin.extensibility.IMixinConfigPlugin;
 import org.spongepowered.asm.mixin.extensibility.IMixinInfo;
@@ -29,6 +30,7 @@ public class MixinPlugin implements IMixinConfigPlugin {
 
     @Override
     public void onLoad(String mixinPackage) {
+        MixinExtrasBootstrap.init();
     }
 
     @Override

src/main/java/moe/nea/firmament/mixins/MixinDrawContext.java

@@ -1,2 +0,0 @@
-package moe.nea.firmament.mixins;public class MixinDrawContext {
-}