build: adds assembly description of Experiment.Idioms.
dev: instroduces ITestFixtureFactory.
refactor: uses ITestFixtureFactory interface instead of Func delegate.
docs: adds release note for ITestFixtureFactory.
refactor: removes unused using directives.
dev: implements MemberReferenceCollector.
refactor: uses MemberReferenceCollector in correct places.
dev: fixes that IndirectReferenceAssertion verifies whether a base

type of a certain type exposes any indirect reference
refactor: clarifies some test names.
dev: adds null guard clause to MemberReferenceCollector.
build: addresses code-analysis warning.
build: increment patch version,

to indicate that this fixes IndirectReferenceAssertion.