Add custom texture pack support

src/main/kotlin/moe/nea/firmament/features/texturepack/CustomSkyBlockTextures.kt

@@ -0,0 +1,35 @@
+package moe.nea.firmament.features.texturepack
+
+import net.minecraft.client.util.ModelIdentifier
+import moe.nea.firmament.events.CustomItemModelEvent
+import moe.nea.firmament.events.TickEvent
+import moe.nea.firmament.features.FirmamentFeature
+import moe.nea.firmament.gui.config.ManagedConfig
+import moe.nea.firmament.util.extraAttributes
+
+object CustomSkyBlockTextures : FirmamentFeature {
+    override val identifier: String
+        get() = "custom-skyblock-textures"
+
+    object TConfig : ManagedConfig(identifier) {
+        val enabled by toggle("enabled") { true }
+        val cacheDuration by integer("cache-duration", 0, 20) { 1 }
+    }
+
+    override val config: ManagedConfig
+        get() = TConfig
+
+    override fun onLoad() {
+        CustomItemModelEvent.subscribe {
+            if (!TConfig.enabled) return@subscribe
+            val extra = it.itemStack.extraAttributes
+            val id = extra.getString("id")
+            if (id.isNotBlank())
+                it.overrideModel = ModelIdentifier("firmskyblock", id.lowercase(), "inventory")
+        }
+        TickEvent.subscribe {
+            if (it.tickCount % TConfig.cacheDuration == 0)
+                CustomItemModelEvent.clearCache()
+        }
+    }
+}