WIP: Support environment variables

Closed Zdenek Farana requested to merge byF/msitools:environment-variables into master

It's working (already built an installer which modifies system PATH). I still gotta add tests. Let me know if I've missed anything so far.

Btw very nice and clean code; it was easy to figure out what to do! 👍

closes #9

Edited by Marc-André Lureau

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