Initial version

This program will traverse a provided directory structure renaming files
that Google rejects in archive (zip/7z) by expanding the restricted
extensions to contain an underscore between the letters.  Running the
program against that directory again will reverse that process, turning
the expanded extension back into the original format.
Ex:  restricted.exe becomes restricted.e_x_e when run the first time,
and restricted.e_x_e becomes restricted.exe when it is run again.
So, run it once before you create the archive file, gmail that file
somewhere, and then run it on the extracted folder.