iprt/cpp/list.h,iprt/cpp/mtlist.h: Added assertions for index out of range conditions and tried to force those cases to have predictable non-destructive behavior. (Not possible when indexing an empty list, unfortunately.) Fixed RTMemRealloc bugs. Added missing read locking. Also changed the testcase to not wait forever in the multithreaded test2() function.

iprt-cpp/list: added RTMEMEF_NEW_AND_DELETE_OPERATORS; changed private data to protected; docs

iprt-cpp: More RTC*List methods. Added explicit constructors to the specializations.

IPRT-C++: iprt::list -> RTCList; iprt::mtlist -> RTCMTList

IPRT-C++: add a thread-safe variant of the generic list class