In the Android input header file, an enum has a value taking more than
31 bits, leading to the following warning:
ISO C restricts enumerator values to range of ‘int’
Since we don't use it, remove it.
To control the device from the computer:
- retrieve mouse and keyboard SDL events;
- convert them to Android events;
- serialize them;
- send them on the same socket used by the video stream (but in the
opposite direction);
- deserialize the events on the Android side;
- inject them using the InputManager.