Although the method is marked as thread safe in the docs, if you use a
database plugin it ends up not being thread safe.

Operator = is not thread-safe, but copy constructor looks to be. This
is causing an intermittent crash.

QSerialPort buffering too slow on Windows.

Need to check for QImage failure otherwise it will through a qWarning.

Found by valgrind.

Therefore Mouse3DInput has been changed to now inherit from that base class and implement the necessary interface.