Enhancements for .desktop file

[Adam Williamson]

I noticed some problems in Mixxx's .desktop file while making the Mandriva package. The following patch changes these things:

- the Encoding setting is removed (it's obsolescent currently, I think). You may want not to include this change, I'm not sure if it's correct for all distros or only MDV.
- a GenericName is added (some desktops expect this).

The Icon is changed from 'mixxx-icon.png' to 'mixxx-icon'. This is correct as per current XDG standards (specifying an extension is incorrect), but requires another change: icons need to be installed as per the freedesktop.org icon theme, as they used to be in Mixxx 1.5 but no longer appear to be in 1.6 (to the /usr/share/icons/hicolor ... tree).

StartupNotify=true is specified.

The categories are amended to include Qt;

the empty GenericName[en_CA] field is removed, it doesn't seem to be doing anything useful.

[jus (jus)]

Better late then never...
Adapted patch for 1.8 and pushed in http://bazaar.launchpad.net/~jus/mixxx/skins/revision/2391

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issues/4935