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>

lib/momentum/settings.c

@@ -35,6 +35,7 @@ MomentumSettings momentum_settings = {
     .dark_mode = false, // OFF
     .rgb_backlight = false, // OFF
     .butthurt_timer = 21600, // 6 H
+    .midnight_format_00 = true, // 00:XX
     .spi_cc1101_handle = SpiDefault, // &furi_hal_spi_bus_handle_external
     .spi_nrf24_handle = SpiDefault, // &furi_hal_spi_bus_handle_external
     .uart_esp_channel = FuriHalSerialIdUsart, // pin 13,14
@@ -105,6 +106,7 @@ static const struct {
     {setting_bool(dark_mode)},
     {setting_bool(rgb_backlight)},
     {setting_uint(butthurt_timer, 0, 172800)},
+    {setting_bool(midnight_format_00)},
     {setting_enum(spi_cc1101_handle, SpiCount)},
     {setting_enum(spi_nrf24_handle, SpiCount)},
     {setting_enum(uart_esp_channel, FuriHalSerialIdMax)},