✨ Support per-player Epic ID customization as well

[blackwind]

I have searched through the issues and didn't find my problem.

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Problem

Currently, we're able to specify Steam IDs for each player. This should be supported for the Epic emulator as well.

Possible Solution

Nemirtingas has the epicid key in NemirtingasEpicEmu.json to facilitate this, we just need a UI for it in Nucleus.

Additional information

Use case: Games often lock save files to the user ID that created them. Ideally, they should be locked to my actual Epic ID so I can access them outside Nucleus.