This commit is similar to 788e3b31e1,
and removes more "pure" attributes which were placed on functions that
could throw exceptions, which is illegal according to clang's
understanding of the attribute (but not according to GCC's). GitHub
issue #58 was most likely about StorageDirectoryReader::GetInfo() and
Storage::GetInfo(), which still had "pure" attributes.
Closes#58
The PcmResampler interface is implemented by the two classes
FallbackPcmResampler and LibsampleratePcmResampler. This prepares for
adding more resampler libraries.