Port to Python 3

[quozl]

• write a test plan and measure coverage,
• remove the embedded Box2D library and rely on Linux distributions to package it, see Physics example fails Pippy#66,
• bug fix and iterate until test plan completes with appropriate coverage.
• update embedded CollabWrapper source in order to Port to TelepathyGLib via D-Bus,
• Port to Python 3,
• bug fix and iterate until test plan completes with appropriate coverage.
• test collaboration between two and three instances.

[srevinsaju]

@quozl , I guess we had forgotten to close this

[quozl]

No, had not forgotten, and I've kept the issue updated. While we have a port to Python 3 completed as source code, we don't have the other elements of the project; test plan, measured coverage, and consequent fixes. We also don't have collaboration tested. If you can help with any of the other steps, please do.