If we are spawning applications on the host using the Development service,
then we want those commands to exit when the flatpak-builder process
exits, as can happen from Ctrl^C or kill().
By using a static FlatpakHostCommandFlags we only ever check this a single
time and then each subsequent request will do the right thing.
This adds a section to the main metadata like:
```
[Build]
built-extension=org.the.App.Locale;
```
This can be used to figure out what refs where built that are
related to the app, for example if you want to bundle them all.
Closes: #128
Approved by: alexlarsson
* Add more checksum types for files and archives
Many upstreams don't use sha256, some use even stronger checksums like
sha512, and its nice to be able to use these. Some system uses
weaker checksums, which you can work around by recomputing your own,
but sometimes that is a bit painful, for example when you're
auto-generating flatpak-builder manifests based on some other format
such as npm lock files.
This adds all the checksum types that GChecksum supports in the
glib version we currently use: md5, sha1, sha256, sha512
Christian Hergert