Custom properties can be specified by passing them to a STIX object
constructor in the 'custom_properties' argument, or with the
'allow_custom' argument set to True, which will add any unrecognized
keyword arguments as properties on the object. The 'allow_custom'
argument can also be used with the parse() and parse_observable()
functions.
An error is now raised when attempting to parse objects without a 'type'
property, such as external references, kill chain phases, and granular
markings. The object which contains them is what should be parsed, not
these objects themselves.
Added three new exceptions: DependentPropertiestError, AtLeastOnePropertyError, MutuallyExclusivePropertiesError
Added tests for NetworkTraffic, Process, URL, WindowsRegistryKey and X509Certificate
Added error tests for EmailMessage, NetworkTraffic, Artifact,
Added interproperty checker methods to the base class: _check_mutually_exclusive_properties, _check_at_least_one_property and _check_properties_dependency
Added interproperty checkers to Artifact, EmailMIMEComponent, EmailMessage, NetworkTraffic
Made NetworkTraffic.protocols required
Added X509V3ExtenstionsType class
Use EmbeddedObjectProperty for X509Certificate.x509_v3_extensions
uncomment test_file_example_encryption_error
added _check_object_constrains and properties_populated to base class
added ObjectConstraintError
added _check_object_constrains for File
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