Added "runtime.py", a file that is executed in python thread in runtime, before handling python_eval FBs requests. Added small python editor taken from wxPython demo, and appropriate icon and button to launch it.

<?xml version="1.0" encoding="UTF-8"?>
<BeremizRoot CFLAGS="-g" Linker="g++" LDFLAGS="-g">
  <TargetType>
    <Linux Nice="0"/>
  </TargetType>
  <Connection>
    <Local/>
  </Connection>
</BeremizRoot>