allow custodian to read options from a directory

[Desrever Nu]

Instead (or in addition to) declaring all input files, let custodian specify a directory that contains configuration files.

I imagine a good practice would be to run nubot

java -jar ./secret/path/apikeys.json --options-dir /path/to/options-directory

[Desrever Nu]

Removing milestone: 0.1.6 (automated comment)

[Benjamin Cordes]

not supported. use of UI and single files