This allows a source repo to include a complete metadata file so that it
can be built directly in place using `fdroid build`. If that app is then
included in fdroiddata, it will first load the source repo type and URL
from fdroiddata, then read .fdroid.yml if it exists, then include the rest
of the metadata as specified in fdroiddata, so that fdroiddata has
precedence over the metadata in the source code.
This lets `fdroid build` apps without having a whole fdroiddata setup, but
instead just directly in place in the source code. This also lets devs
optionallu maintain the fdroid metadata as part of their app, rather than
in fdroiddata without loosing any control. This should make it easier to
spread around the maintenance load.
The start up sequence of processes that are based on the .fdroid.* metadata
is a bit different, so this ensures that the environment variables get
properly initialized in all cases.
This also creates a single function where the environment is set. Before
it was being set in multiple places across multiple files.
This simplifies usage, goes from
app['Foo']
to
app.Foo
Also makes static analyzers able to detect invalid attributes as the set
is now limited in the class definition.
As a bonus, setting of the default field values is now done in the
constructor, not separately and manually.
Don't log and exit in an inner metadata function. Handle it at a higher
level and do a proper exception. This also avoids unnecessary passing of
apps all around.
