One component for multiple devices enhancements

Currently it is possible to create one component (js file) and several templates to render this component on different devices.

Technically templates for desktop/tablet may have more actions comparing to mobile. For example more buttons. This means that js code needs to react differently for desktop and mobile component. This is difficult to achieve in current architecture. It would be helpful to have a possibility to add extensions for such scenarios (or inherit one component from another).