Add BLE CLI tests (#502)

* bt: introduce bt CLI commands
* api-hal-bt: add get rssi
* bt: fix cli commands
* bt: fix typos
* Bt: add missing newline in console message

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

applications/bt/bt_i.h

@@ -22,7 +22,6 @@ struct Bt {
     BtState state;
     osTimerId_t update_status_timer;
     osTimerId_t hopping_mode_timer;
-    Cli* cli;
     Gui* gui;
     ValueMutex* menu;
     // Status bar
@@ -43,8 +42,6 @@ void bt_draw_statusbar_callback(Canvas* canvas, void* context);
 
 BtTestChannel bt_switch_channel(InputKey key, BtTestChannel inst_chan);
 
-void bt_cli_info(Cli* cli, string_t args, void* context);
-
 void bt_draw_statusbar_callback(Canvas* canvas, void* context);
 
 void bt_menu_test_tone_tx(void* context);