x86_64 is used as a baseline: the "x86_64" entry, whatever status it has,
is transformed into "all", and then the other entries in ARCHITECTURES
either dropped or rearranged appropriately.
Becasso:
* Upstreamed korli's patch. Now builds on all Haiku plattforms.
* Update to latest commit.
* Improved DESCRIPTION.
* Update HOMEPAGE URL.
* Renamed "BeCasso" everywhere to "Becasso" as that's the actual
name of the app.
* Include documentation and tutorial and the API docs.
ArtPaint:
* Update to latest commit.
* Fix build.
* Include the add-ons.
* Referring the current haiku version explicitly is not needed, since
the RequiresUpdater takes care of setting the version of Haiku used
for building a package.