Make sudo, init prebuild, build and Prepare fields lists and only
concatenate them with '; ' before execution. This allows arbitrary
commands inside the fileds (even && and ';') as we don't need to split
the commands again for rewritemeta.
The .txt format was the last place where the lowercase "builds" was used,
this converts references everywhere to be "Builds". This makes it possible
to load metadata YAML files with any YAML parser, then have it possible to
use fdroidserver methods on that data, like metadata.write_metadata().
The test files in tests/metadata/dump/*.yaml were manually edited by cutting
the builds: block and putting it the sort order for Builds: so the contents
should be unchanged.
```
sed -i \
-e 's/app\.builds/app.get('Builds', \[\])/g' \
-e "s/app\.get(Builds, \[\]) =/app\['Builds'] =/g" \
-e "s/app\.get(Builds, \[\]) =/app\['Builds'] =/g" \
-e "s/app\.get(Builds, \[\])/app.get('Builds', \[\])/g" \
-e "s/app\.get('Builds', \[\])\.append/app\['Builds'\].append/g" \
-e "s/app\['builds'\]/app.get('Builds', [])/g" \
*/*.*
```
Liberapay was originally included using a numeric ID, since they had
not yet finalized the public URLs. Now it is a username. So this
logic prefers the username in Liberapay: field, and keeps the old
LiberapayID: to ease migration. LiberapayID: will not override
Liberapay:. Clients are expected to prefer Liberapay: over LiberapayID:
This code has never been used and contains some insecure uses of shell=True
Building Kivy apps should be done with the buildozer=yes method. The
buildozer method should probably be moved to a provisioner once that is in
place.
For cases like the OpenVPN vuln that was recently announced, it is useful
for fdroiddata maintainers to be able to mark builds that have known
vulnerabilities.
