Marat Al

[ECO-4717] Removed semaphore in favour of an atomic property for synchronised access.

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Closes #1897

Remove call to `registerForRemoteNotifications` from docs/examples

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As per [RSH3a2d](https://ably.com/documentation/client-lib-development-guide/features#RSH3a2d) library should provide call to `registerForRemoteNotifications` by itself. This was done in https://github.com/ably/ably-cocoa/pull/1293 hence the call to `registerForRemoteNotifications` made by users no more required. ┆Issue is synchronized...

As per [TM3](https://docs.ably.com/client-lib-development-guide/features/#TM3) messages can be stored externally and the `VCDiff` procedure for this situation is not clearly described. More context [here](https://github.com/ably/ably-cocoa/pull/1307#discussion_r831495990) ┆Issue is synchronized with this [Jira Task](https://ably.atlassian.net/browse/EDU-722) by...

Detach fails with timeout

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"test__063__Channel__detach__happens_when_channel_is_ATTACHED_if_connection_is_currently__DISCONNECTED" [fails](https://test-observability.herokuapp.com/repos/ably/ably-cocoa/failures/7549a78c-3881-492d-880c-ff30b3b2c0fb) sometimes with "`Attached` is not equal to `Attaching`", since it asserts channel to be in the `Attaching` state before the call to `detach`. But it claims in the...

Some tests check for error message instead of an error code, so when error message changes test begins [failing](https://test-observability.herokuapp.com/repos/ably/ably-cocoa/uploads/1eab1907-fc2b-488e-8313-95be03cfe63a): "test__059__requestToken__ensure_that_the_message_is_rejected". This is ubiquitous across test suite, not only in "test__059...".

Spec alignment for symmetric decryption of messages

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`ably-cocoa` is not aligned with the specs regarding manual decryption of messages according to [TP4](https://docs.ably.com/client-lib-development-guide/features/#TP4) and [TM3](https://docs.ably.com/client-lib-development-guide/features/#TM3). More context [here #207](https://github.com/ably/ably-flutter/issues/207) ┆Issue is synchronized with this [Jira Task](https://ably.atlassian.net/browse/ECO-4314) by [Unito](https://www.unito.io)

in `ARTScheduledBlockHandle` _Originally posted by @sacOO7 in https://github.com/ably/ably-cocoa/pull/1918#pullrequestreview-2054319493_ ┆Issue is synchronized with this [Jira Task](https://ably.atlassian.net/browse/ECO-4795) by [Unito](https://www.unito.io)