Direct Parameters

[teubert]

Add support to set parameters directly using square brackets in the model so that

m.parameters['abc'] = 1

becomes

m['abc'] = 1

Also updated the examples to take advantage of this feature.

.parameters syntax will still work as expected (and be slightly faster), but this provides a cleaner syntax for parameters.

[github-actions[bot]]

Thank you for opening this PR. Each PR into dev requires a code review. For the code review, look at the following:

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• [ ] All errors from static analysis must be resolved.
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• [ ] Any added dependencies are included in requirements.txt, setup.py, and dev_guide.rst (this document)
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