WS events errors.

[a-urth]

There are couple of unsupported ws events, which we either need to remove or make them supported.
WS Error occurred. error: "Unsupported event: rejected" happens on error during tx application which results into it being rejected.
And
WS Error occurred. error: "Unsupported event: execute" - not sure, but i think it happens on smart contract invocation.

[a-urth]

Both mentioned events need to be supported.