diskspace@schorschii: Add more background color options and a circular background

[SpeeQz1]

Desklet name and maintainer

diskspace@schorschii @schorschii

What would you like to see?

@schorschii A good addition to the desklet would be the option to use the dark square background as a circle so that it it is behind the text along with the option to give it a custom color.

That would help with adding more customization to the appearance of the desklet for those who want to further customize it.

Additionally it would be great to have the option to color the free/unused space part of the circle too with other colors other than gray.