Implement the start of TexturedItem class

lib/src/main/kotlin/foundation/esoteric/minecraft/plugins/library/item/CustomItem.kt

@@ -39,7 +39,7 @@ abstract class CustomItem(protected val plugin: CustomItemPlugin, private val it
      * @param item The existing item. The material of this item must match the material of the custom item.
      * @return The transformed `ItemStack`.
      */
-    fun toItem(item: ItemStack): ItemStack {
+    open fun toItem(item: ItemStack): ItemStack {
         require(item.type == material) { "Cannot transform item of material " + item.type + " to item of material " + material.name + "." }
 
         item.editMeta { meta: ItemMeta ->

lib/src/main/kotlin/foundation/esoteric/minecraft/plugins/library/item/TexturedItem.kt

@@ -0,0 +1,30 @@
+package foundation.esoteric.minecraft.plugins.library.item
+
+import org.bukkit.Material
+import org.bukkit.inventory.ItemStack
+import java.nio.file.Path
+
+class TexturedItem : CustomItem {
+
+    companion object {
+        val startingModelData = 7919
+        var texturedItems: Int = 0
+    }
+
+    constructor(plugin: CustomItemPlugin, itemId: String, material: Material, resourcePath: Path) : super(plugin, itemId, material) {
+        texturedItems++
+    }
+
+    constructor(plugin: CustomItemPlugin, itemId: String, material: Material, resourcePath: String) : this(plugin, itemId, material, Path.of(resourcePath))
+
+    override fun toItem(item: ItemStack): ItemStack {
+        super.toItem(item)
+
+        item.editMeta {
+            meta ->
+            meta.setCustomModelData(startingModelData + texturedItems)
+        }
+
+        return item
+    }
+}