Add support for logger-local error handlers #528
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There are some use cases for writing to zerolog from within the ErrorHandler, but today this is extremely tricky to do safely as it can easily lead to ErrorHandlers triggering ErrorHandlers (causing a log bomb). Logger-local error handlers allow us to configure eg. a primary logger with an ErrorHandler that calls a secondary logger with no ErrorHandler.
Event struct was rearranged to save space; gofmt adjusted some doc indenting in log.go.