We regularly pass around strings or filenames or pairs of strings
or filenames and stringlist etc the in the end will be used
as a kind of "command line", with quite a bit of ad-hoc user
code and QtcProcess::addArg etc to set them up and manipulate them.
Let's have a class for that concept.
Change-Id: I288ab939d853b32c717135a65242c584c2beab50
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
4098be05b2