Add themes

[Mibea]

added three themes? WhiteSur Hatter and Papirus (as requested by Pintjebier)

[teamcons]

LOL i was working on adding WhiteSur when i saw this (although the calendar one seems different. Did it change since december ?...)

Fcusr Github looks abandoned ? If you want people to enjoy this, you may have more luck submitting the fork on Gnome Extensions (although i do not know the process)

[Mibea]

Hey, it is possible it had some tweaks since the last screenshot. Submitting the fork is also an unknown for me, Maintaining the code will be even more challenging, especially since ther is a bug in the current version that prevents the dynamic icons to work after a wakeup. i'm good with theming but debugging this code is something else.

[teamcons]

Same here unfortunately. I can monkey-patch and monkey-tweak code, SVG, and stuff from others, but as dumb as it sounds, i am unable to comprehend Javascript specifically

If its truly abandoned by fcusr, i can maybe get it to work for a bit but not long