Add radiobutton (-groups) to frontend

[ArdJonker]

Radiobutton(-groups) sometimes are preferred over a select (e.g. when the number of choices are limited) and often are easier to operate.
They could have the standard form - circles with a dot for the selected option- and preferably a list of buttons that can have an icon and a label:

Of course it acts as a radiobutton group, only one of the buttons can be selected at a time and this option visually stands out.