Build: Add gitignores.
HevPollableFD: Init.
HevBufferList: Init.
HevBuffer: Init.
HevSocket: Init.
HevSocket: Add get_fd.
HevSocket: Implement methods.
HevSocket: Fix connect errno handle.
HevSocks5Proto: Init.
HevSocks5Proto: Pack and unpack.
HevSocks5Proto: Return unpack left size.
HevSocks5Proto: Return 0 directly if atype not supported.
HevSocks5Proto: Add replies.
HevSocks5Proto: Update addr and port packing.
HevSocks5Proto: Fix replies.
HevSocks5Session: Init.
HevSocks5Session: Pass shared buffer list.
HevSocks5Session: Call close notify.
HevDNSResolver: Init.
HevDNSResolver: Track current buffer.