try to reduce number of moveToThread warnings

try to reduce number of moveToThread warnings
I went off on a fools errand of trying to get rid of the QObject::moveToThread
warnings that Qt was spitting out when trying to prepare an icon.

Qt does prefer widgets to be dynamically constructed and to have their
parent widget set, which is what I tried to do to cut down on the
useless chatter.

(Note the chatter only happens on OS X when the frameworks have been installed
into the application bundle).