Fixed thread-safety

Fixed huge mistake in Clock code (Allocating a mutex everytime instead
of locking it)
HashDigest and StringStream class are no longer thread-safe (That was
stupid anyway)


Former-commit-id: d07a6859df27eac2c5171e75720b3963b6a5fbbb

include/Nazara/Core/Resource.hpp

@@ -12,9 +12,9 @@
 #include <unordered_map>
 
 #if NAZARA_CORE_THREADSAFE && NAZARA_THREADSAFETY_RESOURCE
-#include <Nazara/Core/ThreadSafety.hpp>
+	#include <Nazara/Core/ThreadSafety.hpp>
 #else
-#include <Nazara/Core/ThreadSafetyOff.hpp>
+	#include <Nazara/Core/ThreadSafetyOff.hpp>
 #endif
 
 class NzResourceListener;