Add support for new experimental/optional Area File format: areas.ini

As suggested/requested by Fernando Toledo in issue #826, you can:
1. run 'jsexec make_areas_ini.js' to export your areas.bbs file to areas.ini
   (your old areas.bbs is left in place, in tact, unmodified)
2. change your Area File in echocfg->Paths and Filenames->Area File to
   somepath/somefile.ini (e.g. "../data/areas.ini") and SBBSecho will use
   the .ini file format instead of the old AREAS.BBS format (NIH)

You can always go back to your areas.bbs file by just reverting the Area File
setting back to some other non-ini filename (e.g. "../data/areas.bbs").

Incremented version number to v3.23

Of course documentation and echocfg changes will need to follow, but this is
enough to start testing (looking at your Fernando! :-).

I tried to minimize the diff as much as possible and resisted updating
(modernizing, fixing) the very old AREAS.BBS parsing and areafix code.
The new .ini code is largely modeled after the old areas.bbs code, but oh,
xpdev/ini_file makes things so much nicer and easier.

There are no known fixes for any pre-existing area file/fix issues (including
issue #826), but it's always possible I've introduced a new issue.