Graphical option to show/hide HQs

[Beethoven1]

Often you want to visualize where your combat troops are on the map. This can be harder to do if a bunch of HQs are cluttering up your view of the map, with a lot of visual counters that distract your attention from the combat units. So, similarly to how there is a toggle option to turn on/off the graphics of ALL units, it would be useful if there were an option that could toggle on/off HQs specifically - or alternatively that would toggle on/off combat units specifically. Basically the ability to distinguish more easily with a visual glance which units will actually do something in combat and which ones won't.

This could be similar to how there is an option for "no units" - have one under it that says something like "no HQs":