If user does not provide mandatory parameter, `shift 2` will fail but
will not shift anything, resulting in infinite loop.

... turns out it's faster (surprise! ;))

Since `delim` is not empty by default, this also requires to change
logic for determinig if the split will be done--now it's true if any
of --split or --split-field have been provided.

Move cub-command to libexec path to prevent calling them directly,
allowing for better control of environment.

Avoids need to replace __EECC_INI__PATH

eedmenu now does not use special parameter for ini reading.  INI can be
used but we expect user to send it on STDIN (probably using eeini) just
as any other (delimited) file.

A dmenu wrapper to leverage inireader for easier work with style
configuration and to compose key/value based menus.