Clock: 12 hour "midnight format" (#341)

* Clock: 12 hour midnight format

- References #317 and adds the options `12:XX` and `00:XX` in `Settings > System > Midnight Format` to display the preferred clock format past midnight on all clocks (Desktop, Main Menu MNTM style, Lock screen and Nightstand clock app). "12:30 AM" -> "00:30" OR "12:30".

* Fix: Move midnight format setting out of furi_rtc

- Also felt like the midnight format setting was too out of place in `MNTM > Interface` with the 5 other submenu entries, so I put it in Misc for now.

* clock app external

* Moved midnight format setting into new `Interface > General`

* Update applications/main/momentum_app/scenes/momentum_app_scene_interface_general.c

* Update changelog

---------

Co-authored-by: Willy-JL <49810075+Willy-JL@users.noreply.github.com>

applications/services/desktop/views/desktop_view_locked.c

@@ -8,7 +8,6 @@
 #include <locale/locale.h>
 #include <momentum/momentum.h>
 
-#include "../desktop_i.h"
 #include "desktop_view_locked.h"
 
 #define COVER_MOVING_INTERVAL_MS (50)
@@ -79,6 +78,9 @@ void desktop_view_locked_draw_lockscreen(Canvas* canvas, void* m) {
     } else {
         pm = datetime.hour > 12;
         snprintf(meridian_str, 3, datetime.hour >= 12 ? "PM" : "AM");
+        if(datetime.hour == 0) {
+            datetime.hour = momentum_settings.midnight_format_00 ? 0 : 12;
+        }
     }
     snprintf(time_str, 9, "%.2d:%.2d", pm ? datetime.hour - 12 : datetime.hour, datetime.minute);
     snprintf(second_str, 5, ":%.2d", datetime.second);