Importing the findbar from rekonq
FindBar: replace KDE-specific stuff with the closest Qt equivalents
FindBar: reasonable shortcuts
FindBar: use the correct color role

Thanks to Thra11 on IRC for suggesting the correct enum value after I missed it
completely.
GUI: make it possible to inline-search a message
FindBar: clear selection when closing the find bar
searching: add a FIXME about missing feature to scroll the outer container
Merge branch 'inline-find'