General

The in-memory disk cache is now enabled by default. Blocks which are received from other peers will be cached in-memory until they are hashed. This reduces the need to write a block to disk and then read it back in order to determine whether a block has been successfully received.
EngineSettings.ListenPort and EngineSettings.DhtPort are now random by default.
Fixed a bug where ports may not be automatically forwarded as expected, depending on when EngineSettings.AllowPortForwarding is enabled.
Patch from @SICGames to support cross origin resource sharing when using StreamProvider.CreateHttpAsync to stream data via HTTP.
Removed some APIs previously marked as [Obsolete].

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