Adds network_send_bytestring(), network_send_bytestring_to(), and
HOOK_ON_PACKET_BYTESTRING_RECEIVE
This is as close to raw bytes as you can get in lua. It allows you
to efficiently pack as much data as possible into each packet.
The existing network_send() was built for ease of use, but is quite
inefficient when you want to send a lot of data. Each number or int
field in the table amounts to 9 bytes for the key and 9 bytes for the
value. (amounting to 18 bytes per value). Whereas with the new method
you can pack that information into 1, 2, 4, or 8 bytes depending on
your type's size.
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Co-authored-by: MysterD <myster@d>
