new highlighter: highlight just L6/7/8 portals, on orange/red/purple
better than proper level colours for easily spotting the higher level portals
experiment: bring portals to front after every request is rendered, rather than just once at the end

may hurt performance - if so, make it delay before running, or skip if high number of portals
revert bringPortalsToFront change - and add some comments concerning possible better fixes
Merge branch 'master' of https://github.com/jonatkins/ingress-intel-total-conversion