Use the opportunity to rename the lib from cppformat to fmt, refs #4148.
Patch By: adrian
Rebased By: s0600204
Differential Revision: https://code.wildfiregames.com/D2613
This was SVN commit r23562.
cppformat tests failed on MacOS - the global locale was not set and
defaulted to something unexcpeted.
It is now fixed to US notation.
Patch By: Krinkle
Reviewed By: wraitii
Differential Revision: https://code.wildfiregames.com/D1978
This was SVN commit r22378.