moved low level widgets from CSVWorld into a separate namespace/directory
removed a left-over marker
SceneWidget::setLighting was missing an update call
custom push button
make buttons in mode panel act like radiobuttons
return/enter activate the selected button
removed text argument from button constructor, because toolbar buttons will always be icon only
added push mode and icon-less push button constructor
use custom button on toolbar (top level)
set focus when opening a toolbar panel
fixed scene subview focus problem
toolbar tooltip system
replaced custom toolbutton push flag with type enum
added lighting mode tooltips
Merge remote-tracking branch 'scrawl/master'
Fix for Bullet debug assert

After changing the vector comparison to squaredDistance, the threshold
for rejecting similar vectors needed to be readjusted.
added tooltip to user settings button on startup window
added navigation mode button tooltips
added self-adjusting tooltips to the top-level toolbar buttons
when scene toolbar gains focus, focus first button