[FL-2432], [FL-2487] Rework bt keys load and save (#1139)

* bt keys: rework load and save with saved_struct
* bt: rename bt keys storage functions
* furi_hal_nfc: allow context switch during emilation
* bt settings: rework with saved struct
* infrared: replace file worker with dialogs and storage
* Core, Loader: fix thread allocation tracking, much better, so wow.

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

applications/bt/bt_settings.h

@@ -3,10 +3,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 
-#define BT_SETTINGS_VERSION (0)
-
 typedef struct {
-    uint8_t version;
     bool enabled;
 } BtSettings;