Allow per-bone Front Visibility

Currently, we can make the armature (Or any other object ) render in front of the geometry, but sometimes It is very handy to view certain parts of the Rig in front while others not. For example when you're creating controls and handles you are designing to work without in front render and you need to also tweak the skeleton inside (which should be rendered in front).

I think keeping the option to make the whole thing render on top or no is great, but perhaps an option to select the desired bones and change only them, or maybe exclude them from the operation would make things a lot more versatile in this regard.