moxi needs to be able to read basic configuration from a file

[ingenthr]

since the -z flag can have credentials, moxi needs to be able to read configuration from a file

[steveyen]

use
moxi -z /absolute/file/path
or
moxi -z ./relative/file/path
instead of moxi -z [SOME_KEYVALS]

The contents of the file should be [SOME_KEYVALS], where extra whitespace is allowed.