Fix shared library not exporting symbols on Windows #1684
Merged
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Refs #1513.
On Windows a shared library does not have its symbols exported by default, and usually devs would add a dllexport prefix for each symbol to export in source code.
In this PR I use a feature of CMake to automate it, and due to the feature not exporting global variables, I also change the
global_formatter
variable to be a getter function instead.