Open GCF files with a share mode.
GCF testing
Fix wavs not reading all data.
Change Packaging to use Regexs for path searches.
Get GCFs working
GCF tests.
FileSystemPackage, wrapper around System.IO.

Uses our package API so we can treat the file system or a package
(zip/gcf etc) the same.
Passed in root path acts like top root.
FileSystemPackage tests
Testing FileSystemPackage, Wav and Audio.