* Cleanup obsoleted methods
* Add a way to disable UmbracoFile default sink
* Abstract LogViewService so only UmbracoFile sink related things are in the default interface implementation.
* Abstract LogViewRepository so only UmbracoFile sink related things are in the default interface implementation.
* Move GetGlobalLogLevelEventMinLevel to base
* Removed unused internal class and obsoleted its base
* Added missing XML header comments and resolved warnings in service and repository classes.
* Made private method static.
* Addressed issues raised in code review.
* Expose repository from the service base class.
* Restored further obsoleted code we can't remove yet.
* Removed log viewer tests on removed class. We have integration tests for the new service.
* Obsoleted ILogViewer interface.
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Co-authored-by: Andy Butland <abutland73@gmail.com>
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