Remove OpenCV dependency

Noah Davisrequested to merge
work/ndavis/remove-opencv into master

We don't have a reason to depend on OpenCV anymore since KQuickImageEditor will no longer use it soon and we don't really need to use a Lanczos filter. This change should bring a measurable if not dramatic improvement to startup time since a bicubic filter (Qt::SmoothTransformation) has a simpler algorithm than a Lanczos filter.

Merge request reports