Replace Ice::optional and IceUtil::Optional by std::optional #1641
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This PR replaces both Ice::optional and IceUtil::Optional by std::optional, while providing aliases for backwards source compatibility.
I believe the only source-incompatible change is the old IceUtil::Optional provides
get()as an alias forvalue():https://doc.zeroc.com/ice/3.7/language-mappings/c++98-mapping/client-side-slice-to-c++98-mapping/c++98-mapping-for-optional-values
https://doc.zeroc.com/api/ice/3.7/cpp98/classIceUtil_1_1Optional.html
Note: this PR does not replace all Ice::optional / IceUtil::Optional by std::optional, to show that existing code using these names would not be affected. A follow-up cleanup PR should make this global replace.