Improve configuration managment

[MrCreosote]

make a class that is responsible for parsing the config file, normalizing arguments (e.g. whitespace -> None), checking arguments are valid (e.g. something that is supposed to be a url looks like a url) including cross validation, and presents the configuration as instance variables on the class instance to other classes. Other classes then have to do much less redundant checking of the config and failures happen immediately on server startup.