Turns out UIA doesn't support arrays for custom patterns. Throws argument is out of expected range if such type passed for pattern registration. Removed array types from corresponding schema maps and tests. Added test that verifies registration
Renamed attribute-driven pattern interfaces for tests so that they won't duplicate another ones.
Implemented general pattern handler (properties only for now).
Slightly simplified reflection code
Added extensible comment and moved p/invoke method declarations to Core lib
Another pieve of info about custom UIA events implementation
Minor fix