D18144: Implemented find function from console

[Joao Oliveira]

joaonetto added a reviewer: Okular.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D18144

To: joaonetto, #okular
Cc: yurchor, okular-devel, ngraham, darcyshen, aacid