Skeleton / Bone Collections instead of Bone Layers

Collections were amazing in how they were added to Blender 2.80 to replace Layers. The thing is, they didn't go 100% with it, there are still layers in Armatures. I think it would be a lot better to have an Outliner/Collection type setup in the Skeleton panel in the Properties menu.

• Easy and efficient organization
• Makes Blender more consistent
• Would combine Protected Layers, and Layer settings (The shield Icon on the right would make the layer protected), making the menu cleaner

(In the image, the Empty Icons, would be displayed as Bone Icons, but I was lazy to edit in the Icon)