package/Config.in: order alphabetically

Even though new packages are normally added in the right alphabetical order,
there still remain quite a number of incorrect orderings in package/Config.in.
In this patch, alphabetical order is created in each menu.

Note that this sometimes mean that packages that logically belong together, like
cups, gutenprint, hplip, are now split apart.

Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>