FlxSpriteContainer is a special FlxSprite that can be treated like a single sprite even
if it's made up of several member sprites. It shares the FlxGroup API, but it doesn't inherit
from it. Note that FlxSpriteContainer is a FlxSpriteGroup but the group is a FlxContainer.
When to use a group or container
FlxGroups are better for organising arbitrary groups for things like iterating or collision.
FlxContainers are recommended when you are adding them to the current FlxState, or a
child (or grandchild, and so on) of the state.
Since FlxSpriteGroups and FlxSpriteContainers are usually meant to draw groups of sprites
rather than organizing them for collision or iterating, it's recommended to always use
FlxSpriteContainer instead of FlxSpriteGroup.
Available since
5.7.0
.