Use Config struct for options instead of map[string]string #1244
+198
−245
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The Config struct I added in #1240 wasn't directly used much but converted to a map, so I didn't need to rewrite all the code.
This works well enough, but when working on multihost support (host=one,two) I found it's much more convenient to have access to the struct since it can parse (and validate) things to a slice on startup, instead of every time it's used.
So just rewrite the lot.