Fixed many compilation warnings (c++14, like pedantic warnings)

utilite/include/rtabmap/utilite/ULogger.h

@@ -472,8 +472,8 @@ private:
      * @param msg the message to write.
      * @param arg the variable arguments
      */
-    virtual void _write(const char* msg, va_list arg) {} // Do nothing by default
-    virtual void _writeStr(const char* msg) {} // Do nothing by default
+    virtual void _write(const char*, va_list) {} // Do nothing by default
+    virtual void _writeStr(const char*) {} // Do nothing by default
 
 private:
     /*

utilite/include/rtabmap/utilite/UMutex.h

@@ -125,8 +125,8 @@ public:
 #else
 		mutable pthread_mutex_t M;
 #endif
-		void operator=(UMutex &M) {}
-		UMutex( const UMutex &M ) {}
+		void operator=(UMutex &) {}
+		UMutex( const UMutex & ) {}
 };
 
 /**

utilite/include/rtabmap/utilite/USemaphore.h

@@ -208,12 +208,12 @@ public:
 #endif
 
 private:
-	void operator=(const USemaphore &S){}
+	void operator=(const USemaphore &){}
 #ifdef _WIN32
 	USemaphore(const USemaphore &S){}
 	HANDLE S;
 #else
-	USemaphore(const USemaphore &S):_available(0){}
+	USemaphore(const USemaphore &):_available(0){}
 	pthread_mutex_t _waitMutex;
 	pthread_cond_t _cond;
 	int _available;

utilite/include/rtabmap/utilite/UThread.h

@@ -253,8 +253,8 @@ private:
 	  { return UThreadC<void>::Detach(H); }
 
 private:
-	void operator=(UThread & t) {}
-	UThread( const UThread & t ) : state_(kSIdle) {}
+	void operator=(UThread &) {}
+	UThread( const UThread &) : state_(kSIdle) {}
 
 private:
     enum State{kSIdle, kSCreating, kSRunning, kSKilled}; /* Enum of states. */