- we can't use log_* or fatal() before logger_init - err -> errx if errno isn't involved

saves some bytes of memory and removes the limit on the maximum number of vhosts and location blocks.

it seems that linux calls the signal handlers even when we're waiting on sigwait for that signal. Work around that.

use imsg to handle ALL kinds of IPC in gmid. This simplifies and shorten the code, and makes everything more uniform too.