Add support for passing cursor information via URL parameters when running kioclient exec.

Summary:
Second part of fix for a BUG 398998 ( https://bugs.kde.org/show_bug.cgi?id=398998 ).
Kate changes are in D18099.

Test Plan: Printed resulted URL with `qDebug()`.

Reviewers: #plasma, #ktexteditor, broulik, cullmann, #frameworks, pino, cfeck, dfaure, elvisangelaccio

Reviewed By: dfaure

Subscribers: apol, cullmann, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D18296

BUG: 398998