new plugin: cross links

this plugin colors links red if they are crossing a drawnline.
any yellow if they are inside a drawn polygon.
(requires DrawTools)
cross-links: replaced intersection approximation

(inside polygons has to be rewritten)
cross-links: moved to extra layer
cross-links: better layer-order
cross-links: refactored collision test
cross-links: replaced direct hooks by events
cross-links: process collision links only once (and delete if needed)
cross-link: fixed delete links
cross-links: fixed create hook
cross-links: always bring layer to front
Merge branch 'master' of https://github.com/McBen/ingress-intel-total-conversion into McBen-master
Merge branch 'McBen-master'