[UX] Rename 'server_id' to 'server_key', add validation to value input

[4Ply]

The name server_id is ever so slightly ambiguous, and it could be easier for a new user to see server_key which matches the response from https://parsecgaming.com/server-key

Additional validation could be added to ensure that the User does not paste additional unwanted information (such as :server_key=*********************).

Another nice to have feature would be to support pasting into this field, as I was only able to use the context-menu to paste.

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