marked trace launcher dialog fields as required and toggle okay button
made launcher app path persistent between vogleditor runs
Revert "made launcher app path persistent between vogleditor runs"

This reverts commit 066af2d49b4b5fc4f8a91c0511d660a77354a635.

Pull-request feedback didn't want to use QSettings.  Need to rewrite using settings file.
Merge pull request #169 from strattonbrazil/master

adding formatting features to 'Generate Trace' dialog in vogleditor