[Tuxpaint-i18n] Magic API development docs migrated to `tuxpaint-docs` repo; supports l10n

[Bill K. <nb...@so...>]

The documentation that explains to developers how to use
the Tux Paint Magic tool API to write new effects has been
migrated from the 'tuxpaint' repo -- where it was a hand-coded
HTML file in English -- to 'tuxpaint-docs' -- where it is
a PHP-based HTML file with strings wrapped in gettext().

It's a lot of technical content, and I figured translators
wouldn't appreciate seeing their PO file bloated with a
bunch of text they might never want to bother localizing.

Therefore, I've rigged things up in the 'tuxpaint-docs'
repo to create & maintain separate POT & PO files for
this one new document ("MAGIC-API"), leaving the main
POT & PO files (for all of the other user docs:
"README", "OPTIONS", etc.) untouched.

I have NOT yet updated my PO Stats updating system, or
added reference to the new MAGIC-API-related POT/PO
files to the website.  It's about 3am and I'm about
3 hours late getting to bed. :-)

Hopefully I can work on doing that later this week.
In the meantime, if anyone wants to take a peek,
you can of course see these files in the Git repo:

  https://sourceforge.net/p/tuxpaint/tuxpaint-docs/ci/master/tree/po/

(the files named "...-magic-api.xxx")

Thanks for your patience with me and my nonsense. ;-)

-- 
-bill!
Sent from my computer