Migrate to Starscream

[DamianSullivanCiti]

Replace SocketRocket with Starscream.

[SrinivasVa-Kore]

@DamianSullivanCiti Thanks for your pull request.

Currently we and our customers are not facing any issues with SocketRocket. We have a plan to migrate objective-C dependencies to Swift in KoreBotSDK.

We will merge this pull request once QA certifies it.

[DamianSullivanCiti]

Thanks! FYI the reasons we need it are

Self Signed SSL
Our servers use self signed SSL, and SocketRocket doesn't work with self signed SSL. Starscream has support build in. https://github.com/daltoniam/Starscream#self-signed-ssl

Blackberry Dynamics
Our servers aren't accessibly on the internet, we have to access through Blackberry Dynamics. Blackberry dynamics doesn't support web sockets at all, however we forked Starscream and build a websocket implementation which works over Blackberry Dynamics.