Added kano-button spinner to Proxy Screen and Account screen

Yeah, that's something I will change.  I started refactoring the styling - so there is a function to add common styling (common.css and colours.css) and once that adds styling from a specific file path.  I only realised I called them such similar names when changing the import statements.  These functions weren't the focus of this pull request, I only included them as it moves some very repetitive code into toolset.  I want to do a separate pull request for the CSS problems, so these names won't stay as they are for long.