SaveState()
Mostly for my own peace of mind.
IsCounting
Covering nested object reverts not firing the parent's `RevertResult` event in accordance with what the xmldoc of the event states.
Don't show epilepsy warning when storyboards are disabled
SkinnableSound
TestSceneSkinnableSound
Add
AddRange
Container
IEnumerable
Drawable
counters
As suggested by bdach as this would make the last two commits useless Refs: 5d15426
5d15426
CompositeDrawable
KeyCounter
HUD
Fix `GameplaySampleTriggerSource` not considering nested objects when determining the best sample to play
I also took the freedom to add type checking, as we can't limit the usage of `Add()` since it's a Container. The exception thrown also advises of using the suggested `AddTrigger()` instead.