[FL-3400] External menu apps (#2849)

* FBT, applications: add MENUEXTERNAL app type
* FBT, uFBT: build MENUEXTERNAL as EXTERNAL app
* Loader menu: show external menu apps
* LFRFID: move to sd card
* FBT: always build External Applications list
* Archive: look for external apps path
* Infrared: move to sd card
* Apps: add "start" apps
* iButton: move to sd card
* BadUSB: move to sd card
* External apps: update icons
* GPIO: move to sd card
* Loader: look for external apps path
* U2F: move to sd
* SubGHz: move to sd
* Apps: "on_start" metapackage
* NFC: move to sd
* Sync f7 and f18

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

applications/main/bad_usb/application.fam

@@ -1,15 +1,12 @@
 App(
     appid="bad_usb",
     name="Bad USB",
-    apptype=FlipperAppType.APP,
+    apptype=FlipperAppType.MENUEXTERNAL,
     entry_point="bad_usb_app",
-    cdefines=["APP_BAD_USB"],
-    requires=[
-        "gui",
-        "dialogs",
-    ],
     stack_size=2 * 1024,
     icon="A_BadUsb_14",
     order=70,
     fap_libs=["assets"],
+    fap_icon="icon.png",
+    fap_category="USB",
 )