Settings: Allow user to manually set RTC per-game

[TheTechnician27]

Description of Changes

Allows the user the option to manually input a date and time for the PlayStation 2's real-time clock rather than 2020-04-03 00:00:00 for input recording and the OS' system clock otherwise. Only works if the BIOS is set to a region which is GMT+0 and DST is Summer Time (which is the default PCSX2 uses).

Rationale behind Changes

Multiple games have mechanics that play with the real-time clock.

• Tool-assisted speedrunners may want the ability to designate an arbitrary start date and time for RNG purposes.
• Some games make use of the date for an in-game event, such as Scooby-Doo! Night of 100 Frights' multiple holidays.
• Some games make use of the advancement of real time for an in-game event, such as The End's boss fight in Metal Gear Solid 3.
• Some games make use of the time for an in-game event, for example Ratchet 2 and 3 which have a teleporter to the Insomniac Museum in the dead of night.
• Because we can.
• Closes [Feature Request] System time and date fetching #4491.

Suggested Testing Steps

• Make sure you can't access this from the global settings, only per-game.
• Make sure this setting persists with reboots.
• Make sure you can't go beyond the bounds of 2000-01-01 and 2099-12-31.
• Make sure (using aforementioned BIOS defaults) that the date and time in games corresponds to the time you set on the clock. (I've tested this in the BIOS to confirm minutes and seconds work, but you might not be able to get that granular.)
• Make sure the tool tips are free of typos and adequately convey the information.

Screenshots

Tested on 2005-03-09 03:04:05

[GovanifY]

Quick check, been a while since I have done a review on the emulator, so feel free to correct me if I'm being a dumbass :)

[Mrlinkwii]

looks good from functionality point of view

[kamfretoz]

Tested on macOS, works.