When PlayableGroup.h is used without Playable.h, the compiler spits out a
very unintuitive error message, which would probably confuse unfamiliar
users.
This change fixes that error message appearing.
Signed-off-by: Squareys <Squareys@googlemail.com>
Should be obvious and are positioned above each other, so getting to the
getter from the setter vice versa should be easy.
Signed-off-by: Squareys <Squareys@googlemail.com>
Playable manages the position, orientation and gain of an
`Magnum::Audio::Source`. PlayableGroup is its corresponding FeatureGroup,
which enables playing/pausing/stopping multiple sounds sources, aswell as
setting a common gain and sound transformation for them.
Signed-off-by: Squareys <Squareys@googlemail.com>