IMixinFixer.fix now takes a dedicated MixinNodeTransformer argument

MixinNodeTransformer supersedes the old MixinFixerUtils and doesn't expose the ClassNode of the mixin to Fixers.
ModMixinFixer.getFixers has also been changed, now taking an IMixinInfo instead of the FQN of the mixin.

src/main/java/me/modmuss50/optifabric/compat/MixinFixerExtension.java

@@ -1,6 +1,5 @@
 package me.modmuss50.optifabric.compat;
 
-import me.modmuss50.optifabric.compat.fix.IMixinFixer;
 import me.modmuss50.optifabric.compat.fix.ModMixinFixer;
 import me.modmuss50.optifabric.mod.OptifabricError;
 import me.modmuss50.optifabric.mod.OptifabricSetup;
@@ -55,9 +54,9 @@ private static void prepareMixin(IMixinInfo mixinInfo, ClassNode mixinNode) {
 			// Don't scan the whole class again.
 			return;
 		}
-		List<IMixinFixer> fixers = ModMixinFixer.INSTANCE.getFixers(mixinInfo.getClassName());
-		fixers.forEach(fixer -> fixer.fix(mixinInfo, mixinNode));
-		if (fixers.stream().anyMatch(IMixinFixer::shouldUpdateClassInfo)) {
+		MixinNodeTransformer transformer = new MixinNodeTransformer(mixinInfo, mixinNode);
+		ModMixinFixer.INSTANCE.getFixers(mixinInfo).forEach(fixer -> fixer.fix(transformer));
+		if (transformer.shouldUpdateClassInfo()) {
 			mixinInfo.getTargetClasses().forEach(target -> CLASS_INFO_UPDATES.put(target, false));
 		}
 		PRE_MIXINS.add(mixinNode);
@@ -100,7 +99,7 @@ private static void handleErrorInjectors(IMixinInfo mixinInfo, ClassNode mixinNo
 	}
 
 	private static String getError(IMixinInfo mixinInfo, MethodNode method) {
-		boolean compat = !ModMixinFixer.INSTANCE.getFixers(mixinInfo.getClassName()).isEmpty();
+		boolean compat = !ModMixinFixer.INSTANCE.getFixers(mixinInfo).isEmpty();
 		return String.format("Injector method %s in %s couldn't apply due to " +
 				(compat ? "outdated compatibility patch" : "missing compatibility patch!") +
 				" Please report this issue.",