Don't watch for changes on existing lines

How did we miss this angular 1.3 feature? 
It appears to be a bit similar to bindonce, but also works in ng-repeat!

See https://docs.angularjs.org/guide/expression#one-time-binding
Wrap inlinecolour filter in $sce.trustAsHtml

This is required because bo-html is unsafe whereas ng-bind-html requires
"safe" HTML (ng-bind-html-unsafe is deprecated since 1.2)
Remove bindonce for Angular 1.3 One-Time Bindings
Merge pull request #418 from glowing-bear/kill-the-watchers

[PLS TEST] Don't watch for changes on existing lines, s/bindonce/angular one-time binding/