Added the Re-Activating state to the state machine to handle deactivate and activate sequentially when the middleware delays the onDestroy callback. Also tidied up some comments on the different states.
Added the Re-Activating state to the state machine to handle deactivate
and activate sequentially when the middleware delays the onDestroy
callback.
Also tidied up some comments on the different states.

Signed-off-by: Ian Bell <0d758edcea1ee41e310557e12912661536d29218@nyx.com>

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