Support a number of useful media keys in kmap2qmap

Change-Id: Iacc2e3c8d4fa5e638da6f01e224aaefe42ff700c
Done-with: Andrew den Exter <andrew.den.exter@jollamobile.com>
Done-with: Vesa Halttunen <vesa.halttunen@jollamobile.com>
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>