Remove Source/{Unittests,TestSuite}.

These directories have been unused for several years and without any automated
way of running the tests, they are pretty much useless.

While they might be useful as a reference, in their present state they should
not be kept in the repository.

Source/UnitTests/CMakeLists.txt

@@ -1,6 +0,0 @@
-set(SRCS	AudioJitTests.cpp
-			DSPJitTester.cpp
-			UnitTests.cpp)
-
-add_executable(tester ${SRCS})
-target_link_libraries(tester core)