Option to set initial visibility state for each bone category

[d87]

Starting every gpose with with enabling overlay on yourself and then proceeding to hide 6 out of 8 bone categories isn't fun.
So it would be nice to have settings for each category if it should be visible when you start + sensible defaults maybe.

[d87]

Also, just show the player skeleton overlay initially after you open up gpose. The way you have to expand the actor entry, then turn on skeleton visibility isn't very intuitive, people who are new would just not understand what to do. And if i don't want overlay, I'll just hide the UI which you do anyway for screenshots