This is an initial implementation of the mgmt language. It is a
declarative (immutable) functional, reactive, domain specific
programming language. It is intended to be a language that is:
* safe
* powerful
* easy to reason about
With these properties, we hope this language, and the mgmt engine will
allow you to model the real-time systems that you'd like to automate.
This also includes a number of other associated changes. Sorry for the
large size of this patch.
It's up to the end user to decide who is writing and/or overwriting
them.
It could also be useful to reimplement (refactor) some of the existing
World API's to be implemented in terms of these primitives.
Since we don't return the actual values and instead only tell about
events (which leaves the `Get` of the value as a second operation) then
we don't have to use a channel with backpressure since all the events
are identical.
