Add section-object support to new tests, improve test confinement. #trivial

[Adlai-Holler]

• Fix unit testing memory leaks caused by mock objects retaining their invocations, which retain their arguments, which may retain the mocks.
• Automatically verify all mocks during [ASTestCase tearDown].
• Add section-object testing to the new collection tests file.
• Better encapsulate unit tests:
  • Ensure the autorelease pool is drained, and the dealloc queue is drained, inside of invokeTest:.
  • Ensure that view controllers aren't retained by windows after test ends (system may retain windows).
  • Break retain cycles: (mockObject -> invocations -> owner -> mockObject) by automatically registering all mocks created during tests, verifying them, then removing their saved invocations.
  • Manually verify that, as of now, no transient objects survive between test cases. No easy way to automate this verification.
• Let Xcode move the ASAssert.m file reference that it seems to really want to move.
• ASWeakSet: Use NSHashTable* constant names, instead of NSPointerFunctions*. This is shorter and it shows that we are compliant with the data structure.