[Feature Request] Set Style for Individual Feed or Group

[habay]

Set a style for one feed or for a group of feeds, overruling the default style.

This could be done from the info window with an option 'Overrule default style' where one could select the desired style from a drop down menu (which hosts the same styles as found in the View->Style menu).

As groups dont have an info window yet, a group-info window should be added with the same option.