Fix control typo.
Fixes on plugin loading order, now before trying to load the last behaviour, and at AB side (not server).
Fixes to Python3 plugin, ab module can resolve symbols, and all existing symbols return something, but on node nothing can be done yet.
Added support for dir at nodes.
Added list of nodes and types, and initial nodes.py easy handler for behaviours.
Updated codemirror, added support for python3 module.