Hydrilla

enable using with Python 3.7

make "uuid" an optional property

specify full schema URL in instances

when generating JSON documents, put generating software info in 'generated_by' property

make resource dependency specifier an object

change file path format

From now on we'll be using format 'file/sha256/' instead of 'file/sha256-'.

include new schemas in package and in tests

fix typing mistake i tests

move to a namespace package under 'hydrilla'

test&fix error handling