This puts all of the needed post parsing checks on the metadata into a
single method that is used by all parsing methods (.txt, JSON, XML, YAML).
This provides the single place to normalize the internal representation of
the metadata.
It would be good to also change the internal representation to use more Python
bool/int types so that less post parsing is needed for JSON, XML, and YAML.
The SMSSecure test .pickle was changed to account for the use of lstrip()
and rstrip() on all 'script' types.
This also changes the example JSON to use ints for versionCodes
The AntiFeatures metadata is a comma-separated list of tags, like
Categories, so it should also be stored internally as a list. This makes
parsing XML and JSON easier.
The test cases' .pickle files look like they change a lot, but they really
don't, its only the change of default AntiFeatures value from None to []
The .pickle was created by dumping the output from parsing the current .txt
metadata for org.adaway. The JSON started from that pickle dump, but was
then hand edited to be more proper JSON, e.g. using boolean values.
