Move desktop files and use desktop-directories from menu spec

[hellcp]

Thanks to those changes, we won't need to set an icon in the code, it will be handled by the toolkit instead, based on desktop filename, parsed by yast2 script and ycc.

Using menu spec is beneficial because it will be used twice, by yast and by desktops trying to display application lists

• Change the way groups are defined  #936
• Switch desktop directory yast-rake#70
• Move desktop files yast-devtools#143

DO NOT MERGE UNTIL THERE IS A PR TO YCC

[ancorgs]

This looks kind of stalled for more than a year now. @hellcp What's the status?

[hellcp]

It is, I haven't finished the ycc part still, though those changes are still needed in the long run