[wix-devs] 6196 - Create log for ExePackage

[Sean Hall]

https://github.com/wixtoolset/issues/issues/6196 is about getting Burn to
capture the output and error streams from the ExePackage and writing them
to a log file. Blair commented on the issue basically saying that he would
like a way to opt out.

I was thinking about implementing this as a new ExePackage/@Protocol type
("captureStreams"?) and setting it as the default. The Protocol could be
set to "none" to use the v3 behavior. Are there other ways we want to do
this?