Add ability to adjust RTC

[networkfusion]

Description

The Real time clock can become out of sync. Although (at least on the SC64) it is possible to adjust it, and also in some DD games, it should be possible to set it through the menu.

How to solve the problem

See: https://github.com/DragonMinded/libdragon/blob/af650428e9615f4e08d8e7eae187929a90c15ccc/examples/rtctest/rtctest.c

Describe alternatives you've considered

No response

Additional context

See menu/views/rtc.c