Add Framework side of stdapi.fs.file.mv

Add the appropriate methods to Rex side of the FS extension and
the commensurate command dispatcher.

Requires https://github.com/rapid7/meterpreter/pull/6 from the
meterpreter repo as well as compiling fresh DLL for
ext_server_stdapi.
Bins for new stdapi_fs_file_move command

See rapid7/meterpreter#6
Landing #1579, meterpreter mv

See rapid7/meterpreter/#6
Add a test for stdapi_fs_file_move

Also disables tests for sniffer, which is crashy.
Make msftidy shut up

How did those pesky CRs get in there in the first place?