Added option to toggle overview with mouse right click
Top Window Intellihide - Fixed issue where tooltip on lower windows of same 
app caused dock to hide
Fixed issue with dragging thumbnail windows to different workspace - 
dragging now forces overview mode
Elliminated unnecessary signal connections causing dock to resize when 
entering overview mode repeatedly with right click on dock
Changed intellihide mode preferences for clarity
Top Window Intellihide - Reworked code
Rearranged preferences dialog and modified intellihide descriptions for clarity