Add edit backpacks button to /firm storage

src/main/kotlin/util/render/DrawContextExt.kt

@@ -0,0 +1,8 @@
+package moe.nea.firmament.util.render
+
+import org.joml.Matrix4f
+import net.minecraft.client.gui.DrawContext
+
+fun DrawContext.isUntranslatedGuiDrawContext(): Boolean {
+	return (matrices.peek().positionMatrix.properties() and Matrix4f.PROPERTY_IDENTITY.toInt()) != 0
+}