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

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

lib/momentum/settings.h

@@ -92,6 +92,7 @@ typedef struct {
     bool dark_mode;
     bool rgb_backlight;
     uint32_t butthurt_timer;
+    bool midnight_format_00;
     SpiHandle spi_cc1101_handle;
     SpiHandle spi_nrf24_handle;
     FuriHalSerialId uart_esp_channel;