scintilla: send event when completion popup is selected

(integrated from komodo (trunk) change 84495 by toddw)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@14306 b87d16e7-d29f-4ee1-b5ec-817d645d335f
prefs: add uilayout_version entry, to avoid upgrades on new installs

(integrated from komodo (trunk) change 84496 by toddw)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@14307 b87d16e7-d29f-4ee1-b5ec-817d645d335f