Documentation of Scripting and Communication Protocol

[Peter Fritzson]

Feedback from Bill Janssen:

Document the current OM scripting and communication protocol
(e.g. as used between OMEdit and OMC), and in the longer term redesign part of it to make it more consistent.

This is important for eliminating some bugs and misunderstandings
in the OM clients, and making the

Adeel:
OpenModelica scripting environment is already documented ​https://build.openmodelica.org/Documentation/OpenModelica.Scripting.html.

The only problem is that it doesn’t include the interactive module which is almost half of the scripting environment.
We should move all the stuff from interactive to CevalScript & ModelicaBuiltin. Martin had been suggesting this from a very long time now.

PeterF:
We can start now by documenting the existing interactive module API
including small examples, right now, before moving it to
ModeliaBuiltin which will involve some redesign.