CLI: add mv command

[tzach]

a command for moving a file/dir, compatible with linux semantic:

mv [OPTION]... [-T] SOURCE DEST
mv [OPTION]... SOURCE... DIRECTORY
mv [OPTION]... -t DIRECTORY SOURCE...

The following subset of options are useful:
-f, --force
do not prompt before overwriting
-i, --interactive
prompt before overwrite
-t, --target-directory=DIRECTORY
move all SOURCE arguments into DIRECTORY
-T, --no-target-directory
treat DEST as a normal file
-u, --update
move only when the SOURCE file is newer than the destination
file or when the destination file is missing
--help display this help and exit

[tzach]

can be base on #11