BT hid navigation fix (#911)

* bt: fix bt hid navigation
* Cli: change datetime format to more ISO-ish, add datetime validation.

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

firmware/targets/furi-hal-include/furi-hal-rtc.h

@@ -47,6 +47,8 @@ void furi_hal_rtc_set_datetime(FuriHalRtcDateTime* datetime);
 
 void furi_hal_rtc_get_datetime(FuriHalRtcDateTime* datetime);
 
+bool furi_hal_rtc_validate_datetime(FuriHalRtcDateTime* datetime);
+
 #ifdef __cplusplus
 }
 #endif