Allow fields in structs that are subtype of a class.

Comparing 1.04.7 and 1.04.11 failed, use compare list instead of str compare.

MinimumSamplingInterval is from Type Duration/Double so a float. Correct xmlparser.

prevents unsupported identity tokens to create a session

* Previously a client could not read values with bad status.
* This functionality can be toggled on and off.
* Added tests.

Fixes #856

get_origin, get_args already defined

- mirror change from mypy
- ignore mypy errors
  - better to fix issues step by step

UAExpert sends its application certificate as client certificate in the initial `CreateSessionRequest`.
The user certificate is sent as `ua.X509IdentityToken` in the request body and has to be looked up there.

* init

* add: is_abstract check and typehints

* change import for Node

* change import for Node

* remove nodeclass-typehints due to import error

* add test for instantiate abstract type

* edit: change ValueError to UaError

* edit: test

support for union types in struct104

Fixed parameter named from lowercase to CameCase in statemachine.install.