Styles for standardising radiobutton checkboxes

Adding styles for standardising radio buttons and checkboxes
• Add the new styles
• Tweak button styles because labels are now floated
• Add contains floats to to list of buttons

https://www.agileplannerapp.com/boards/105200/cards/5197
After searching all the repos involved in this i.e. static, feedback, smart-answers and calculators the only instance of 'medium' class that exist is on the next buttons in smart answers. So I think this should be fine.