* Set max buffer size to maximum allowed
I'm evaluating this library for an application that sends ~60kb size UDP messages. Without this setting the messages are cut off at the default message size.
This is probably something you'd want to set with `const socket = dgram.createSocket('udp4', { maxBufferSize: 'UINT16_MAX' })`. I've modified the library to automatically choose the largest allowed size `GCDAsyncUdpSocket` allows (which is 64kb).
* Set max ipv6 buffer size to uint16 maximum
It was crashing when trying to build a callback argument NSArray with a nil object. NSError's are not guaranteed to have a NSLocalizedFailureReason, so this case should be handled.
Refactor the UdpSockets module _clients array to be a member variable.
Make the UdpSocketClient's delegate a weak reference.
remove reload notificaiton, and rely on dealloc to close all open sockets.
