Define mimetype (application/x-cantor) for cantor worksheets (.cws)
At least on my system, I have to manually create a file type for 'cantor worksheet' (.cws) files to set Cantor as the default application for them. Otherwise, Dolphin just detects it as a zip archive and opens it with Ark. This pull request adds an xml file that is copied to /usr/share/mime/packages/
so that a mimetype application/x-cantor
is defined systemwide for cantor worksheets.