Set the extension's log level based on settings value

[rkeithhill]

PR Summary

We set the log level in the Logger class during construction but then never seem to set it again. This PR loads the settings and sets the desired log level right after the logger is constructed and before all the features are initialized. This is important as some of the features want to do diagnostic logging. Without this change, we never see those diagnostic messages in the log.

There is some risk in moving the Settings.load() earlier in the startup process but I think the Settings class is pretty much a stand-alone, non-Feature based class.

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[rjmholt]

LGTM!