Add /firm exporthotm to save hotm presets

src/main/kotlin/util/mc/CommonTextures.kt

@@ -0,0 +1,7 @@
+package moe.nea.firmament.util.mc
+
+import moe.nea.firmament.Firmament
+
+object CommonTextures {
+	fun genericWidget() = (Firmament.identifier("generic_vanilla_widget"))
+}