[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>

lib/nfc/helpers/mf_classic_dict.h

@@ -6,6 +6,10 @@
 #include <lib/toolbox/stream/file_stream.h>
 #include <lib/toolbox/stream/buffered_file_stream.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef enum {
     MfClassicDictTypeUser,
     MfClassicDictTypeSystem,
@@ -97,3 +101,7 @@ bool mf_classic_dict_find_index_str(MfClassicDict* dict, FuriString* key, uint32
  * @return     true on success
  */
 bool mf_classic_dict_delete_index(MfClassicDict* dict, uint32_t target);
+
+#ifdef __cplusplus
+}
+#endif

lib/nfc/helpers/mfkey32.h

@@ -2,6 +2,10 @@
 
 #include <lib/nfc/protocols/mifare_classic.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef struct Mfkey32 Mfkey32;
 
 typedef enum {
@@ -24,3 +28,7 @@ void mfkey32_process_data(
 void mfkey32_set_callback(Mfkey32* instance, Mfkey32ParseDataCallback callback, void* context);
 
 uint16_t mfkey32_get_auth_sectors(FuriString* string);
+
+#ifdef __cplusplus
+}
+#endif