It was already possible to specify QT_FILE_SELECTORS=touch, but in
Qt Creator, it's more convenient to specify a command line argument
than an environment variable.
Change-Id: I83a86aa88fb0c229d9bcedb6646351f0675db199
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
A follow up commit will contain the touch UI.
Change-Id: I26275fdd31294506821fa3e3e4a4bb63329665b9
Task-number: QTBUG-54952
Reviewed-by: J-P Nurmi <jpnurmi@qt.io>