Sendable conformance + Documentation + PRIVMSG fixes

Forgot to mention on the commit but PRIVMSG will be more accurate about userLogin.

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Minor Improvements

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v1.0.0-beta.4

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Added missing UserNotice SubGift field

v1.0.0-beta.3

Merge branch 'main' of https://github.com/MahdiBM/TwitchIRC

MASSIVE String extensions performance improvements + add some more docs

In my non-scientific tests for String.components(separatedBy:), per 1 million iteration:
Foundation's implementation took 2.5s
The old implementation of mine took 3.8s
And the new implementation takes only 1s
That's around 75% performance improvement!

First beta release :)

v1.0.0-beta.1

Delete .gitattributes