Unifying verbosity flags (ticket #12822)

Hi, I'm working with the #12822 task, which is a refactoring for the verbosity flag. It should be reimplemented in a way, similar to the 'optimization' flag. After studying the codebase, specifically *optLevelFlags*, I'm stuck with the following questions: 1. Should I add a new data 'VerbosityFlag' similar to GeneralFlag, DumpFlag, etc or should I extend any of existing data types? 2. How to determine a set of verbosity options to implement? Is grepping through all the codebase and adding corresponding options a good approach? Thanks! -- Best regards, Sergey Bykov