refactor: compile applets as multicall binary

cosmic-applet-bluetooth/src/lib.rs

@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+mod app;
+mod bluetooth;
+mod config;
+mod localize;
+
+use crate::localize::localize;
+
+pub fn run() -> cosmic::iced::Result {
+    localize();
+    app::run()
+}