tor-ptmgr: add PtReactor
This fleshes out the PtReactor that was previously a stub, making it actually do reactor-ey things. Note that this is entirely untested, and might not work at all. Hopefully it does, though.
This fleshes out the PtReactor that was previously a stub, making it actually do reactor-ey things. Note that this is entirely untested, and might not work at all. Hopefully it does, though.