Improve component manager separation in Base Test Case
Currently all tests get a complete copy (including subobjects) of the component manager injected. This happens in source:Packages/Testing/Classes/T3_Testing_BaseTestCase.php#398 . However, the serialize / unserialize method will surely cause problems as soon as we have persistence in place, so we need a finer grained solution here.
The problem is that some unit tests do change component configuration or even package configuration. This needs to be isolated from other tests.