this also adds missing methods to elements not implementing widget. Note
here that we do not enable sprite and label, as this would produce a
crazy amount of linter warnings due to render() requiering error
handling then, which non of the callers handle. Since we remove the
render calls later anyways, we can postpone this static check for now.
* d2player/game_controls: Refactor HUD into it's own class
game_controls slowly becomes a superclass that does too many things.
So move HUD into it's own class. This is the first step of getting the
renderer out of game_controls (#798)
* d2ui/tooltip: Allow background box to be disabled
* d2ui/tooltip: Make GetSize() a public function
* d2player: Move const from game_controls to hud
* d2player: Fix missing entity hover tooltip
