added basic lazy config - try #2 #83
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I took some of the suggestions from #82 and made a more stripped down implementation of the lazy config sources.
Basically the goal is: ConfigSources manage their entire state and minimal assumptions are made about the internal workings of a ConfigSource by other Config objects. This makes ConfigSources extendable without having to worry about
Configurationmaking assumptions about how a ConfigSource is composed.So for example, say you have some custom complicated source that consists of some set of multiple files. By abstracting away
ConfigSource.exists, the config source can define that state on its own withoutConfigurationever having to be privy to those details.