Refactor getMathMLEntity() to use std::string_view
and OUString for string handling, so that there is less
string conversion when calling this function.
Use std::find_if to find formula in array instead of a loop.
Change-Id: I0ed98d33e62f6bc730ac750f4fd545d2f07145fc
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/182065
Tested-by: Jenkins
Reviewed-by: Hossein <hossein@libreoffice.org>
Simon Chenery
7b9e27da20