Rename output binary to t(alawah)wrk

I want to make it clear this is not the official version of wrk, just a hastily created fork. It will probably crash your computer and ruin you relationships. Run away while you still can.

define _DEFAULT_SOURCE on linux

send hostname in TLS SNI extension

remove dependency on unspecified behavior

add defines and includes for solaris

start request timer before first write

copy request string from lua stack

cleanup & pipelining for 3.1.0 release

correct dependency order for parallel builds

fix Host header with port or IPv6 address