64-bit value is an array 2 of 32-bit values. In SFTP, changed up all the
uses (most) of word64 to word32 arrays. Not all systems we support have
64-bit types available.
2. Added a local dynamic memory type in the ports for strings.
3. Removed the includes for winsock2.h. It is included by windows.h.
4. In the example client, switched fin and fout to macros to stdin and
stdout. While they are FILE in POSIX, in Windows they are a function.
2. Split the error check on the Windows file write into two checks.
3. Check the success of closing the local file in Windows.
4. Rearrange the Get state machine to attempt to close the remote file
first then the local file. The local file close is always attempted.