netcode 1.4.6: payload packets carry the reader's eight bytes of slack

[gafferongames]

A payload packet now carries eight bytes of slack behind the payload it hands to your reader. netcode returns a pointer into a struct allocated at sizeof plus payload_bytes, and serialize's BitReader loads an eight-byte window from the byte at the read position, so a read that starts in the last seven payload bytes used to reach past the allocation; the old one-byte trailing array left four bytes of alignment padding where the reader contract needs eight. The trailing array is eight bytes, a compile-time check pins it so it cannot shrink, and the arithmetic that sizes the packet is unchanged everywhere else. Nothing on the wire changes and no symbol changes; a consumer that reads netcode payloads through serialize, yojimbo included, gets an in-bounds read on every packet by relinking. Servers and clients should take this release.