refactor: removes unnecessary if statement.
dev: improves performance of ReferenceCollectingVisitor and makes it

tread-safe.
build: adds pragma to suppress build warnings.
dev: implements the Verify(Assembly) method.
docs: adds release note for Verify(Assembly).
refactor: uses Verify(Assembly) instead of Visit(AssemblyElement)

in scenario test.
dev: installs Moq to Experiment.IdiomsUnitTest.
dev: let ReferenceCollectingVisitor call base methods.
docs: clarifies XML document of RestrictingReferenceException.
dev: implements HidingReferenceException class.
dev: introduce HidingReferenceAssertion.
dev: implements Assemblies property.
dev: adds guard clause to HidingReferenceAssertion.
refactor: fixes a test failed only on debug mode.
build: updates Albedo to v1.0.1.
dev: implements methods for visiting reflection elements.
dev: introduces ElementReferenceCollectingVisitor.
dev: implements ElementReferenceCollectingVisitor.
dev: implements HidingReferenceAssertion.
dev: ignores excuting Visit(MethodBase)

in ElementReferenceCollectingVisitor.