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OMG write my own objc WebSocketClient

UnittWebSocketClient only supported up to Protocol 10 unless I wanted to use ARC. I already implemented WSs a dozen times now, so what the hell.

Doesn't implement PING or CLOSE etc. as my websocketServer doesn't need them.

Some copypasta as I didn't want to split everything out into non Lua versions with Lua-C wrappers.
Quit shuts down Lua thread safely
Fix MBWebSocketClient masking

Changing NSMutableData (obviously) may realloc the data portion making previous pointers invalid.
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UnittWS RM FIXUP
Supplement WebSocketClient in Lua

Hat-tip: @silentbicycle
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