dev: implement Type propety of GuardClauseAssertionTestCases.
dev: implement ExcludedMembers property.
build: address some code-analysis warnings.
dev: implement some properties of GuardClauseAssertionTestCases.
dev: add guard clause for null Assembly.
refactor:rename ClassWithGuardTestMembers to TypeWithGuardTestMembers.
build: increment minor version,

to indicate that this supports guard clause test-cases on assembly
level.