No longer warn for abstract class properties, as they are now supported

[leonardder]

Link to issue number:

None

Summary of the issue:

When we introduced abstract auto (class) properties in baseObject (#8393), we introduced an exception for abstract class properties, as they aren't supported by Python 2. In Python 3, abstract class properties are supported.

Description of how this pull request fixes the issue:

When creating a magic auto property, don't check whether the method is a class method.

Testing performed:

Tested the following case:

class Test(baseObject.AutoPropertyObject):
	_abstract_test = True
	@classmethod
	def _get_test(cls):
		return(42)

Test()

As expected, this raises TypeError: Can't instantiate abstract class Test with abstract methods test

Known issues with pull request:

The TypeError is raised when initializing an instance of the class. This is by design of Python itself.

Change log entry:

• Changes for developers
  • Abstract class properties are now supported on objects that inherit from baseObject.AutoPropertyObject (e.g. NVDAObjects and TextInfos)