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
reset the dock bar state in the reset function
add a method for clearing the dock bars
update dock manager to save/restore dock bar state
updates to to handle merging of dock bars
more reliable checked tool tip handling
unify the fonts across the style sheets

TODO use a different font on OSX. Segoe UI is a MS font.
Revert "add dock bars to the layout specification"

This reverts commit fcdc3a536ed224ccb50d38b70e211df3e21b062c.
Revert "Revert "add dock bars to the layout specification""

This reverts commit ab94a033b59c112caa4b00c06dbc207ad94eb293.
deprecate old dock layout and add new dock layout
remove dock bar handling from old layouts.

this code never made it into a release, and so is safe to remove.
stage out the old docklayout api