Move from scripts to classes

[pjf]

Right now all end-points and actions are in scripts. There are a lot of them. They're cluttered. They don't inherit from any base class, or consume any common role.

We should fix this, because it will reduce a lot of boilerplate, and will make it much easier to write extensions. At the very least, I expect we'll want roles (or maybe classes) for:

• Exobrain::Source (produces Exobrain::Measurement:: packets)
• Exobrain::Action (consumes measurements, produces intents)
• Exobrain::Sink (consumes Exobrain::Intent:: packets)

Our scripts can then be moved to classes which consume these roles. AFAIK Ubic can start/stop classes just fine. :)

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