Queue statue look and feel

On top of !321 (merged), few things

• I think the running icon is far too small, anyway it is animated
• It's nice to know the state now, but it would be even better to know the amount of queued tasks

So i propose to

• Display a number from 1 to 9+ instead of the state indicator
• Use the main icon for the state
  • Use a cog icon (which make it easy to animate cause it is circular, and easy to stack extra icons cause it is plain)
  • Animated when something is processing
  • With a stacked stop/pause indicator in the center