Race condition loading/writing config file

[zamaudio]

When fyrd is used in a multithreaded way, I ran into a bug where configparser could not read the config due to a previous thread reading or writing the config file at the same time.

I traced it back to a particular config key res_time being loaded every wait loop. It probably should be read outside of the loop, or even in the constructor.

Will be submitting a pull request with a fix.