Reduce header dependencies.

Reduce header dependencies.

Reduce header dependencies.

Fixes linker failure on test/run_output.exe

Casting to std::runtime_error loses information (and prevents RVO).

Shorter.
Signed-off-by: Rosen Penev <rosenp@gmail.com>

* Use PcmExport for 24bit packed output

Replaces the static Duplicate() method.