Fix cmd line interface

[kuefmz]

Fixed these points:

• add missing cmd params for host and port. note that it must be possible to define multiple hosts sucht that time machine can listen on multiple hosts/interfaces .default hosts are 0.0.0.0 and :: and port is 8898
• configure such that default value for every paremeter is shown
• add choices programmatically from enum as shown in the PR comment
• logging parameter has no effect -> needs fixing

[kuefmz]

#92

[kuefmz]

The help string would still need an explanation for all the possible choices.

[kuefmz]

I also added this here, but it didn't add the default values to the help and the trick I did is also from the link you gave me :)