Make environment variables apply to custom commands

[he3als]

Role

I have a script that runs before a Prism Launcher instance.

Suggestion

For environment variables to apply to custom commands.

Benefit

It'd be nice to be able to configure scripts or any other wrappers within the Prism Launcher instance GUI.

This suggestion is unique

• I have searched the issue tracker and did not find an issue describing my suggestion, especially not one that has been rejected.

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This could be a toggle per environment variable as well, I presume there might be cases where people would want Java to have certain variables, but their custom commands not to.