refactor: rename some tests.
dev: add the test to ensure types of specified assembly should not be

exposed externally.
style: re-order members in AssemblyLevelTest.
dev: create new project.
build: rectify assembly titles.
dev: create new test project.
dev: install xunit to Experiment.AutoFixtureUnitTest.
dev: add GlobalSuppressions to the new project.
dev: add the Experiment reference to the new project.
refactor: move AutoFixtureAdapter to the new project.
refactor: rectify assembly names.
dev: add assembly-reference test.
refactor: rectify exception messages.
dev: introduced AutoFixtureTheoremAttribute.
dev: implement CreateTestFixture of AutoFixtureTheoremAttribute.
dev: set base of TheoremAttribute as AutoFixtureTheoremAttribute.
refactor: move Person to inner-class of Scenario.
dev: implement AutoFixtureFirstClassTheoremAttribute.
refactor: remove unused DelegatingSpecimenContext.
build: enable to run tests using VS.