Reorganize and simplify

- Remove AllMaterialSpecs#flwInit

src/main/java/com/simibubi/create/CreateClient.java

@@ -20,7 +20,6 @@ import com.simibubi.create.foundation.config.AllConfigs;
 import com.simibubi.create.foundation.gui.UIRenderHelper;
 import com.simibubi.create.foundation.ponder.content.PonderIndex;
 import com.simibubi.create.foundation.ponder.element.WorldSectionElement;
-import com.simibubi.create.foundation.render.AllMaterialSpecs;
 import com.simibubi.create.foundation.render.CachedBufferer;
 import com.simibubi.create.foundation.render.CreateContexts;
 import com.simibubi.create.foundation.render.SuperByteBufferCache;
@@ -65,7 +64,6 @@ public class CreateClient {
 		modEventBus.addListener(CreateClient::clientInit);
 		modEventBus.addListener(AllParticleTypes::registerFactories);
 		modEventBus.addListener(CreateContexts::flwInit);
-		modEventBus.addListener(AllMaterialSpecs::flwInit);
 		modEventBus.addListener(ContraptionRenderDispatcher::gatherContext);
 
 		MODEL_SWAPPER.registerListeners(modEventBus);
@@ -83,7 +81,7 @@ public class CreateClient {
 		BUFFER_CACHE.registerCompartment(WorldSectionElement.DOC_WORLD_SECTION, 20);
 
 		ShippedResourcePacks.extractFiles("Copper Legacy Pack");
-		
+
 		AllKeys.register();
 		// AllFluids.assignRenderLayers();
 		AllBlockPartials.init();

src/main/java/com/simibubi/create/content/contraptions/components/structureMovement/render/FlwContraption.java

@@ -182,7 +182,7 @@ public class FlwContraption extends ContraptionRenderInfo {
 		private final ContraptionInstanceManager tileInstanceManager;
 
 		public ContraptionInstanceWorld(FlwContraption parent) {
-			switch (Backend.getInstance().getEngine()) {
+			switch (Backend.getEngine()) {
 			case INSTANCING -> {
 				InstancingEngine<ContraptionProgram> engine = InstancingEngine.builder(CreateContexts.CWORLD)
 						.setGroupFactory(ContraptionGroup.forContraption(parent))

src/main/java/com/simibubi/create/foundation/render/AllMaterialSpecs.java

@@ -1,7 +1,6 @@
 package com.simibubi.create.foundation.render;
 
 import com.jozufozu.flywheel.api.struct.StructType;
-import com.jozufozu.flywheel.event.GatherContextEvent;
 import com.simibubi.create.Create;
 import com.simibubi.create.content.contraptions.base.flwdata.BeltData;
 import com.simibubi.create.content.contraptions.base.flwdata.BeltType;
@@ -18,22 +17,12 @@ import net.minecraftforge.api.distmarker.OnlyIn;
 
 @OnlyIn(Dist.CLIENT)
 public class AllMaterialSpecs {
-	public static void init() {
-		// noop, make sure the static field are loaded.
-	}
 
 	public static final StructType<RotatingData> ROTATING = new RotatingType();
 	public static final StructType<BeltData> BELTS = new BeltType();
 	public static final StructType<ActorData> ACTORS = new ActorType();
 	public static final StructType<FlapData> FLAPS = new FlapType();
 
-	public static void flwInit(GatherContextEvent event) {
-		event.getBackend().register(Locations.ROTATING, ROTATING);
-		event.getBackend().register(Locations.BELTS, BELTS);
-		event.getBackend().register(Locations.ACTORS, ACTORS);
-		event.getBackend().register(Locations.FLAPS, FLAPS);
-	}
-
 	public static class Locations {
 		public static final ResourceLocation ROTATING = Create.asResource("rotating");
 		public static final ResourceLocation BELTS = Create.asResource("belts");

src/main/java/com/simibubi/create/foundation/render/CreateContexts.java

@@ -1,10 +1,10 @@
 package com.simibubi.create.foundation.render;
 
-import com.jozufozu.flywheel.backend.GameStateRegistry;
+import com.jozufozu.flywheel.core.GameStateRegistry;
-import com.jozufozu.flywheel.backend.source.FileResolution;
-import com.jozufozu.flywheel.backend.source.Resolver;
 import com.jozufozu.flywheel.core.Templates;
 import com.jozufozu.flywheel.core.compile.ProgramCompiler;
+import com.jozufozu.flywheel.core.source.FileResolution;
+import com.jozufozu.flywheel.core.source.Resolver;
 import com.jozufozu.flywheel.event.GatherContextEvent;
 import com.jozufozu.flywheel.util.ResourceUtil;
 import com.simibubi.create.Create;

src/main/java/com/simibubi/create/foundation/render/RainbowDebugStateProvider.java

@@ -2,28 +2,18 @@ package com.simibubi.create.foundation.render;
 
 import javax.annotation.Nonnull;
 
-import com.jozufozu.flywheel.core.compile.ShaderConstants;
 import com.jozufozu.flywheel.core.shader.GameStateProvider;
-import com.simibubi.create.Create;
+import com.jozufozu.flywheel.core.shader.ShaderConstants;
 import com.simibubi.create.content.contraptions.KineticDebugger;
 
-import net.minecraft.resources.ResourceLocation;
-
 public enum RainbowDebugStateProvider implements GameStateProvider {
 	INSTANCE;
-	public static final ResourceLocation NAME = Create.asResource("rainbow_debug");
 
 	@Override
 	public boolean isTrue() {
 		return KineticDebugger.isActive();
 	}
 
-	@Nonnull
-	@Override
-	public ResourceLocation getID() {
-		return NAME;
-	}
-
 	@Override
 	public void alterConstants(@Nonnull ShaderConstants constants) {
 		constants.define("DEBUG_RAINBOW");