Fix compile issues (#378)

* target correct class for obf

* delete class cache if its outdated

Author: WaitingIdly

src/main/java/com/cleanroommc/groovyscript/core/mixin/groovy/CompUnitClassGenMixin.java

@@ -13,7 +13,7 @@
 import org.spongepowered.asm.mixin.injection.callback.LocalCapture;
 
 @Pseudo
-@Mixin(targets = "org/codehaus/groovy/control/CompilationUnit$3", remap = false)
+@Mixin(targets = "org/codehaus/groovy/control/CompilationUnit$2", remap = false)
 public class CompUnitClassGenMixin {
 
     @Inject(

src/main/java/com/cleanroommc/groovyscript/sandbox/CustomGroovyScriptEngine.java

@@ -234,6 +234,10 @@ CompiledScript checkScriptLoadability(File file) {
                 comp.clazz = null;
             }
             comp.setRequiresReload(true);
+            if (lastModified > comp.lastEdited) {
+                // delete class bytes to make sure it's recompiled
+                comp.deleteCache(this.cacheRoot.getPath());
+            }
             if (lastModified > comp.lastEdited || comp.preprocessors == null) {
                 // recompile preprocessors if there is no data or script was edited
                 comp.preprocessors = Preprocessor.parsePreprocessors(file);