Core/Build: Fixed dynamic mode build

Core can now be built in dynamic mode, enabling the hotswap system to be
used.

Hotswap works fine on Windows. Didnt work for me on Debian, the rebuild
and reload process happens but the old version of the module remains for
some reason. Cant figure it out right now

src/server/shared/Packets/ByteBuffer.h

@@ -51,7 +51,7 @@ public:
     ~ByteBufferPositionException() throw() { }
 };
 
-class ByteBufferSourceException : public ByteBufferException
+class TC_SHARED_API ByteBufferSourceException : public ByteBufferException
 {
 public:
     ByteBufferSourceException(size_t pos, size_t size, size_t valueSize);