Deprecate load16_be() function in favor to ntohs() function.

[starter48]

load16_be() function is inefficient and basically does the same work as ntohs().

[madeye]

Thanks! One thing blocks merging as-is: replacing load16_be() (byte-wise, alignment-safe) with ntohs(*(uint16_t*)ptr) introduces an unaligned 16-bit load from a char* buffer — undefined behavior that can fault or misread on stricter-alignment targets (e.g. some ARM). Also in src/server.c the change drops ntohs() entirely (port = *(uint16_t*)(...)), flipping byte order on little-endian hosts. Could you keep an alignment-safe accessor (e.g. memcpy into a uint16_t then ntohs)? Happy to merge once that's addressed.