Add DISABLE_CLASS_COPY macro (and use it)

Use this macro to disallow copying of an object using the assignment
operator or copy constructor.  This catches otherwise silent-but-deadly
mistakes such as "ServerMap map = env->getMap();" at compile time.

If so desired, it is still possible to copy a class, but it now requires
an explicit call to memcpy or std::copy.

src/threading/mutex.h

@@ -44,6 +44,7 @@ DEALINGS IN THE SOFTWARE.
 	#include <pthread.h>
 #endif
 
+#include "basicmacros.h"
 
 class Mutex
 {
@@ -59,6 +60,8 @@ private:
 #else // pthread
 	pthread_mutex_t mutex;
 #endif
+
+	DISABLE_CLASS_COPY(Mutex);
 };
 
 #endif  // C++11

src/threading/semaphore.h

@@ -28,6 +28,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 	#include <semaphore.h>
 #endif
 
+#include "basicmacros.h"
 
 class Semaphore {
 public:
@@ -46,6 +47,8 @@ private:
 #else
 	sem_t semaphore;
 #endif
+
+	DISABLE_CLASS_COPY(Semaphore);
 };
 
 #endif

src/threading/thread.h

@@ -161,6 +161,7 @@ private:
 	std::thread *m_thread_obj;
 #endif
 
+	DISABLE_CLASS_COPY(Thread);
 };
 
 #endif