support/scripts: add gen-manual-lists.py

Script generating the target and host package tables, and the deprecated
stuff list as well. These tables and lists are generated parsing the
Config.in files.

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
[yann.morin.1998@free.fr: no leading dot, no menu path for host-utils]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>