Port locations runner away from deprecated methods & cleanup

• Do not use deprecated RunnerContext::type()
• Write the url always in the data, this way we don't need to do all the parsing twice.
• The concept of the case insensitive search does not make sense in this runner. If the user want to have case insensitive file search the baloo/recent docs/places runners should be used.
• Do not show a match when we are sure the file does not exist. This would only show a KIO error message when launching it, consequently there is no point in showing the message in the first place.

Test Plan (should still work):

• ~/foo
• $HOME/foo
• mailto:somebody@kde.org
• vnc:/foo
• ssh://localhost
• http://www.example.com
• example.com
• file:///home/user/kde/
• \server\path

Does not produce results anymore:

• file:///home/user/doesnotexist
• ~/doesnotexist
• $HOME/doesnotexist

The second commit fixes https://bugs.kde.org/show_bug.cgi?id=358221

@ngraham @broulik