codeintel: css: lazily load the css property attributes
* as importing, sorting and wrapping takes a significant amount of time

(integrated from komodo (trunk) change 81093 by toddw)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13305 b87d16e7-d29f-4ee1-b5ec-817d645d335f