Open all URLs in command line arguments
Test Plan: Run the falkon command with multiple URLs, e.g: ./falkon example.com kde.org
A new falkon window with each URL opened in a new tab. First URL selected.
Reviewers: #falkon
Subscribers: falkon
Tags: #falkon
Differential Revision: https://phabricator.kde.org/D27655
Original author: abogical (Abdel-Rahman Abdel-Rahman)