Add selective data export to CLI

[Pytal]

Close #94

Description:
  Export a user.

Usage:
  user:export [options] [--] [<user> [<folder>]]

Arguments:
  command               The command to execute
  user                  user to export
  folder                local folder to export into

Options:
  -l, --list[=LIST]     List the available data types, pass --list=full to show more information [default: false]
  -t, --types=TYPES     Comma-separated list of data type ids, pass --types=none to only export base user data [default: false]
  -h, --help            Display this help message

[Pytal]

/backport to stable24

[come-nc]

Did not test, will do tomorrow hopefully.

[come-nc]

The help does not match behavior:

Usage:
  user:export [options] [--] [<user> [<folder>]]

occ user:export bob
                                                                                                                        
 [ERROR] Missing folder argument       

This cannot be fixed easily I think

[come-nc]

How hard would it be to add an --ouput option like core commands to get the list in json format?

[come-nc]

(tested and works, you can merge)

[Pytal]

The help does not match behavior:
…
This cannot be fixed easily I think

Not with the existing symfony console framework, errors are thrown as needed to inform the user

How hard would it be to add an --ouput option like core commands to get the list in json format?

Will be tracked in #170