Refactor python2 scripts for python3

[markus2342]

There are a number of python2 scripts in the scripts directory which should be converted to python3.

Typical issues to be encountered will be the use of strings as arguments to socket.sendto. This behaviour has changed with python3. socket.sendto now accepts a byte type as argument.
Ideally these affected scripts would be modified to use the FlipdotAPI which takes care of sending data to the flipdot matrix.