scimoz: scale (CSS) pixel coordinates from the rest of the app into
(device) pixel coordinates for use with Scintilla.
http://bugs.activestate.com/show_bug.cgi?id=100492

This fixes issues with opening context menus on Windows with HiDPI displays

(integrated from komodo (trunk) change 82907 by marky)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13931 b87d16e7-d29f-4ee1-b5ec-817d645d335f