Composite Model Parameter

[teubert]

Closes #143

Updated composite model so that setting parameters in the composite model will update the composed models. For example, setting "abc.def" will update parameter "def" of composed model "abc".

Also added to jupyter notebook and added test.

This feature was requested by the SWS project for a model of their SWS Safety Service

[github-actions]

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[kjjarvis]

Nice addition!

[kjjarvis]

Should "model_name.parameter name" be "model_name['parameter name']" to match the code below it? (perhaps either syntax would work?)