dev: introduce the DefaultMembers class.
dev: add guard clause to DefaultMembers.
dev: implement the Type property.
build: update Albedo to v0.11.2.
dev: implement GetEnumerator of DefaultMembers.
dev: implement AllRefractions.
build: address some code-analysis warnings.
dev: implement AllMemberRefractions.
build: install AutoFixture.Idioms(v3.0.1).
dev: implement AssertionAdapter.
dev: add guard clause to AssertionAdapter.
dev: implement the Assertion property.
dev: address SutReferencesOnlySpecifiedAssemblies.
dev: implement Visit(AssemblyElement).
dev: implement the Value property.
dev: implmenet some Visit methods.
dev: introduce IAssertionFactory.
refactor: use IAssertionFactory instead of Func delegate.
dev: introduce GuardClauseAssertionFactory.
dev: implement the Create method.