TODO:
can log_file be written to?
add systemd unit?

gmi.pl needs to accept an arguemnt, where the config.toml is located.

remove magic numbers

make log output user adjustable

add gmiaccess stuff

add cgi stuff

better magic detection

check if loaded cert/keys are actually valid

check values for keys in config file

handle signals like interrupt better

recently-accepted-cert-cache for specific cert-req keys, doing a look up EACH and EVERY TIME can be expensive when it it likely that a single person will be looking around.

reduce complexity in cert_req()