Add support for environment variables

[Alerymin]

I'm trying to add "Return to Castle Wolfenstein" for GOG, but I need to add 2 environment variables in order to make it work, but I can't find a way to do so in the json files.

I need also to change the game folder name as by default it ends with a space which breaks winetricks.

[arielj]

What are the 2 env variables?

Feature requests are probably better added in the main heroic repo since that repo has to implement the feature first to put content in this repo (this is more like a database, the actual feature doesn't live in this repo)

[Alerymin]

MESA_EXTENSION_MAX_YEAR: '2005'
 __GL_ExtensionStringVersion: '17700'

I saw them in this Lutris script, and unless you patch the game, it won't start without these: https://lutris.net/games/install/14707/view

[arielj]

I'd recommend adding this as a feature request in heroic's issues.

I want to add something like this at some point (I know Celeste also needs one env variable to work for example).

[Alerymin]

just did it

[imLinguin]

I think we should leave current workarounds to the point of setup only, and not go into altering runtime setup. ULWGL will cover this as one centralized effort.