refactor: compile applets as multicall binary

cosmic-applet-battery/src/lib.rs

@@ -0,0 +1,17 @@
+#[rustfmt::skip]
+mod backlight;
+mod app;
+mod config;
+mod dgpu;
+mod localize;
+mod power_daemon;
+mod upower;
+mod upower_device;
+mod upower_kbdbacklight;
+
+use localize::localize;
+
+pub fn run() -> cosmic::iced::Result {
+    localize();
+    app::run()
+}