Radio-button, Checkbox and Switch: align to web standards

[tishoyanchev]

radio-button, checkbox and switch components have a value property instead of checked prop. Replace value with checked for on/off behavior, and introduce 'value' as a string.
In addition:
Two radio-buttons with the same name attribute do not toggle because the radio-button component is made up of

elements. The input element is missing.
Integrate the Input element following the example of the checkbox component, and make sure two radio-buttons with the same name toggle.

Related issue: #1476