Add formatted prinbt function for LCD menu and use systick vonversion in uptime shell command

stm-firmware/shell.c

@@ -189,8 +189,18 @@ static shellmatta_retCode_t shell_cmd_uptime(const shellmatta_handle_t   handle,
 {
 	(void)arguments;
 	(void)length;
+	uint32_t days;
+	uint32_t hours;
+	uint32_t mins;
+	uint32_t secs;
 
-	shellmatta_printf(handle, "Uptime: %llu secs", global_tick_ms/1000);
+	systick_get_uptime_from_tick(&days, &hours, &mins, &secs);
+
+	shellmatta_printf(handle, "Uptime: %u day%s %02u:%02u:%02u",
+					days, (days == 1 ? "" : "s"),
+					hours,
+					mins,
+					secs);
 	return SHELLMATTA_OK;
 }