[Fix] Verify that a valid Wine/Proton prefix exists before running any Wine command

[CommandMC]

This will prevent Heroic from running any Wine commands unless all files required in a Wine/Proton prefix are actually present, which will in turn prevent us from creating invalid Proton prefixes (note that this will not fix already broken Proton prefixes)

This is achieved by checking for known-required prefix files in runWineCommand. If any are missing, verifyWinePrefix is used to create / hopefully fix the prefix.
Because of that, Proton will no longer get skipped in verifyWinePrefix (even though wineboot itself doesn't actually get ran, which is fine since Proton creates the prefix itself)

If you really have to disable this check when running commands (verifyWinePrefix uses runWineCommand to create the prefix for example), pass skipPrefixCheckIKnowWhatImDoing to runWineCommand

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Use the following Checklist if you have changed something on the Backend or Frontend:

• Tested the feature and it's working on a current and clean install.
• Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• Created / Updated Tests (If necessary)
• Created / Updated documentation (If necessary)

[imLinguin]

Looks good to me

[flavioislima]

Looks good!
Thanks for fixing it! 👍