Fix recipe conflict between nahuatl shield core and obsidian plating

Casting obsidian either gives you a shield or a shield core based on which recipe won. Solved it by allowing nahuatl in the part builder and ditching composite for shield cores (all options are able to be made without composite)

src/generated/resources/data/tconstruct/tinkering/materials/definition/nahuatl.json

@@ -1,5 +1,5 @@
 {
-  "craftable": false,
+  "craftable": true,
   "hidden": false,
   "sortOrder": 2,
   "tier": 3

src/main/java/slimeknights/tconstruct/tools/data/ToolsRecipeProvider.java

@@ -10,6 +10,7 @@
 import net.minecraft.world.level.ItemLike;
 import net.minecraftforge.common.Tags;
 import slimeknights.mantle.recipe.helper.ItemOutput;
+import slimeknights.tconstruct.common.TinkerTags;
 import slimeknights.tconstruct.common.data.BaseRecipeProvider;
 import slimeknights.tconstruct.fluids.TinkerFluids;
 import slimeknights.tconstruct.library.data.recipe.IMaterialRecipeHelper;
@@ -19,6 +20,7 @@
 import slimeknights.tconstruct.library.recipe.casting.ItemCastingRecipeBuilder;
 import slimeknights.tconstruct.library.recipe.casting.material.MaterialCastingRecipeBuilder;
 import slimeknights.tconstruct.library.recipe.ingredient.MaterialIngredient;
+import slimeknights.tconstruct.library.recipe.partbuilder.PartRecipeBuilder;
 import slimeknights.tconstruct.library.recipe.tinkerstation.building.ToolBuildingRecipeBuilder;
 import slimeknights.tconstruct.library.tools.nbt.MaterialIdNBT;
 import slimeknights.tconstruct.shared.TinkerMaterials;
@@ -234,9 +236,14 @@ private void addPartRecipes(Consumer<FinishedRecipe> consumer) {
     partCasting(consumer, TinkerToolParts.plating.get(ArmorSlotType.BOOTS),      TinkerSmeltery.bootsPlatingCast,      2, partFolder, castFolder);
     partRecipes(consumer, TinkerToolParts.maille, TinkerSmeltery.mailleCast, 2, partFolder, castFolder);
 
-    // bowstrings and shield cores are part builder exclusive
+    // bowstrings are part builder exclusive, but also support composite
     uncastablePart(consumer, TinkerToolParts.bowstring.get(),  1, partFolder);
-    uncastablePart(consumer, TinkerToolParts.shieldCore.get(), 4, partFolder);
+    // no shield core composite, conflicts with tool casting
+    PartRecipeBuilder.partRecipe(TinkerToolParts.shieldCore.get())
+                     .setPattern(TinkerToolParts.shieldCore.getId())
+                     .setPatternItem(Ingredient.of(TinkerTags.Items.DEFAULT_PATTERNS))
+                     .setCost(4)
+                     .save(consumer, prefix(TinkerToolParts.shieldCore, partFolder + "builder/"));
   }
 
   /** Helper to create a casting recipe for a slimeskull variant */

src/main/java/slimeknights/tconstruct/tools/data/material/MaterialDataProvider.java

@@ -49,7 +49,7 @@ protected void addMaterials() {
     // tier 3
     addMaterial(MaterialIds.slimesteel,     3, ORDER_GENERAL, false);
     addMaterial(MaterialIds.amethystBronze, 3, ORDER_HARVEST, false);
-    addMaterial(MaterialIds.nahuatl,        3, ORDER_WEAPON,  false);
+    addMaterial(MaterialIds.nahuatl,        3, ORDER_WEAPON,  true);
     addMaterial(MaterialIds.obsidian,       3, ORDER_WEAPON,  false);
     addMaterial(MaterialIds.roseGold,       3, ORDER_SPECIAL, false);
     addMaterial(MaterialIds.pigIron,        3, ORDER_SPECIAL, false);