Make streaming operators for more std types.

[MakoEnergy]

Not everything in the standard library can be streamed. Parts of the Unit Test framework expect any variable being tested (namely TestEqual) to be streamable.

Of note, and what prompted this issue, std::type_info and std::type_index do not have streaming operators in the standard library, but these should be straightforward to implement ourselves. Likely other types exist this should apply to as well.