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Fixes #134
Master Issue: #
Motivation
Switch to use boost::optional instead self-written Optional class
Modifications
Remove class Optional in Utils.h and change all usage to boost::optional
Verifying this change
(Please pick either of the following options)
This change is a trivial rework / code cleanup without any test coverage.
(or)
This change is already covered by existing tests, such as (please describe tests).
Documentation
doc-not-needed
This is internal structure, not a public API