distinguish sizeHint from minimumSizeHint
add title_editable and title_bar_visible knobs
add editability and clicked signals to the title bar
toggle maximization on double click
toggle maximization on title double click
expose editable flags and signals
hookup the editable and visibility knobs
proxy the force hidden state
hook up the title bar right click event
hookup right click event on dock tab
persist linked state with the dock layout