* Adds language configuration support to `.analysis_options`:
analyzer:
language:
enableSuperMixins: true
(with validation).
* Extracts context configuration out of `server` context_manager and into `analyzer` where it can be re-used by `analyzer_cli`.
* Some general cleanup of option validation (with more to come!)
R=brianwilkerson@google.com
Review URL: https://codereview.chromium.org/1423333002 .
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