Editor: Implement drag-dropping of the minimap selection
http://bugs.activestate.com/show_bug.cgi?id=97641
r=marky
sr=toddw
See the bug for remaining issues.

(integrated from komodo (trunk) change 81855 by ericp)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13601 b87d16e7-d29f-4ee1-b5ec-817d645d335f