Fix elided text issues in the dock title bar label.
Provide a workaround for issue #37

This works around a segfault in Qt with widget graphics effects.
https://bugreports.qt-project.org/browse/QTBUG-24792
Fix issue #40

This fixes the issue where two close buttons are shown on the dock tabs
on OSX.
add a Frame widget type
base Container on Frame
base ScrollArea on Frame
WIP commit to fix the background color issues in a scroll area when using stylesheets.
add testing script
fixup background color handling
base the FlowArea on Frame
update the dock area tool bars

This updates the dock tool bar items to be resizable and use stylesheet
for the drop shadow instead of a graphics effect. The graphics effects
are more expensive and segfault on OSX.
Add pin and unpin bitmap images
Add a pin button to the dock item title bar
Add support for custom check state tool tip
proxy the pin button state
add logic to support pin button toggling
Add pin button support
update tooltip for dock window buttons
git rid of the old text editor files
add dock bars to the layout specification