Move code from ArrangeActAssertAspectAttribute to ContextSpecificationBase. Rename simplified aspect to InvokeTestsAspect.
Fix duplicate test run.
Code cleanup.
Fix XML doc.
Add mising namespace imports.
Remove ArePrerequisiteTestsRunning and BaseSetUp from IContextSpecification.
Change from pfx to snk.
Change from pfx to snk.
Delete pfx file.
Delete old unused files.
Change CategorizeUnitTestFixturesAspectAttribute from TypeLevelAspect to InstanceLevelAspect.
Try to fix broken InvokeTestsAspect.
Make ContextSpecificationBase.Act an explicit implementation.
Add MulticastAttributeUsage back to TplContextAspectAttribute.
Apparently the InstanceLevelAspect doesn't pass the instance in targetElement. Reverting back to TypeLevelAspect.