add MTU config for QUIC #567
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The default MTU config for QUIC is 1200 bytes; whereas in Netcode we specify a max payload size of 1200 bytes but a max buffer size (with all the headers, etc.) of 1300 bytes.
I hadn't really seen issues before, because QUIC does MTU discovery and increases the MTU if a higher value is available.
However it can be good to also force QUIC to use a min MTU of 1300 bytes.