Add edit backpacks button to /firm storage

src/main/kotlin/gui/EmptyComponent.kt

@@ -0,0 +1,17 @@
+package moe.nea.firmament.gui
+
+import io.github.notenoughupdates.moulconfig.gui.GuiComponent
+import io.github.notenoughupdates.moulconfig.gui.GuiImmediateContext
+
+class EmptyComponent : GuiComponent() {
+	override fun getWidth(): Int {
+		return 0
+	}
+
+	override fun getHeight(): Int {
+		return 0
+	}
+
+	override fun render(context: GuiImmediateContext) {
+	}
+}