Add module for command line option parsing

Especially mcetool has already a lot of options and there are multiple
places that need to be edited when new options are added. This easily
leads into situations where something is forgotten or wrong - like usage
information that is either completely missing or does not match the
actual command line parsing logic.

The basic idea is to make command line parsing as data driven as possible
by defining a structure to hold
- long option name and short option character
- option and parameter description texts
- callback functions for actual processing

Arrays of these can then be used to construct data needed by normal
getopt_long() and provide --help output in consistent manner.
Use mce-command-line for parsing mce command line options

No functional changes.

Minor tweaks to --help output and reporting bugs email address updated.
Use mce-command-line for parsing mcetool command line options

No functional changes.

Minor tweaks to --help output and reporting bugs email address updated.

[mce] Use mce-command-line for parsing mcetool command line options. Fixes JB#18916
Merge pull request #163 from spiiroin/command_line

Improve mce and mcetool command line parsing