Adds `USE_BYOND_TRACY`, which automatically loads a given prof.dll/libprof.so using https://github.com/mafemergency/byond-tracy/. Not intended for use in production, and we do not ship a copy of byond-tracy. It is extremely easy to compile yourself, but if you're someone interesting enough to play around with this then let me know and I can just give you a build. I'm going to be using this for init profiling.