Refactor Support Kit tests

* Use CPPUNIT_TEST(_SUITE) macros and autoregistration.
* Remove unnecessary header files.
* Consolidate Archivable, Autolock, MemoryIO and MallocIO tests into
  one .cpp file.
* This structure makes it easier to add new tests - from adding .cpp
  and .h + updating Addon.cpp file (3 files), only one .cpp file is
  needed now.
* Convert string_utf8 test from standalone app to CppUnit test.

Change-Id: I18d90eb66b7cfc5576626b66ed85e47eb64547bf
Reviewed-on: https://review.haiku-os.org/c/haiku/+/10399
Reviewed-by: Kacper Kasper <[email protected]>
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: waddlesplash <[email protected]>

headers/tools/cppunit/ThreadedTestCaller.h

@@ -4,6 +4,8 @@
 //#include <memory>
 #include <cppunit/TestCase.h>
 #include <cppunit/TestResult.h>
+#include <cppunit/Test.h>
+#include <ThreadedTestCase.h>
 #include <cppunit/TestCaller.h>
 #include <TestShell.h>
 #include <ThreadManager.h>