### Description of Changes
- Adds Swap Memory Card function.
- Adds Helper Function to verify whenever memory cards are auto-ejecting.
- Adds assert to make sure the memory cards swapping function will only RunOnCPUThreat.
- Adds field to set a custom hotkey under Controllers>Hotkeys to quickly swap memory cards.
### Rationale behind Changes
- Allow users to change memory cards on demand. This is really useful on shared machines, specially with kids around (Forget kids accidentally overwriting your save games with over 100 hours of gameplay!).
- This will easy up process for saving on backup memory cards on the fly without the need of auxiliary tools such as "mymc".
- By creating a memory card swap function in the core, we can now use it anywhere.
### Suggested Testing Steps
- Assign hotkey under Controllers>Hotkeys>Swap Memory Cards and test while on BIOS Browser or in game.
Special thanks to @kamfretoz @RedDevilus , @RedPanda4552 , and @Mrlinkwii for the feedback, suggestions and troubleshooting!
Co-Authored-By: pandubz <redpanda4552@gmail.com>
Co-Authored-By: KamFretoZ <14798312+kamfretoz@users.noreply.github.com>
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