Made the examine window a little transparent so that you can see things behind it. This prevents the examine popup from occluding gameplay.
Moved the ExamineEntity bind from Human to Common context so that it will always be available to clients. Ghosts can now examine things.
* Removes static `IoCManager` service locator calls from `Robust.Shared.Map` namespace.
* Misc code cleanup and filling out doc comments for Map classes.
* Added Union and Intersect methods to Box2.
* Any touched component was converted from static IoC calls to field injection.
Sibling PR to https://github.com/space-wizards/RobustToolbox/pull/796.