Resolve Yaml paper cuts

[ischoegl]

Changes proposed in this pull request

This PR aims to address remaining points raised in #1053

• Add Species.from_dict creation (in analogy to Reaction.from_dict)
• Add ability to pass YAML syntax to anymap_from_dict
• Address some YAML code formatting in Sphinx

If applicable, fill in the issue number this pull request is fixing

Closes #1053

If applicable, provide an example illustrating new features this pull request is introducing

E.g. mixing YAML syntax when defining a species:

data = {
    "name": "H2O",
    "composition": "{H: 2, O: 1}",
    "thermo": "{model: constant-cp, h0: 100}", # value is formatted as YAML code
}
species = ct.Species.from_dict(data)

Checklist

• The pull request includes a clear description of this code change
• Commit messages have short titles and reference relevant issues
• Build passes (scons build & scons test) and unit tests address code coverage
• Style & formatting of contributed code follows contributing guidelines
• The pull request is ready for review

[ischoegl]

Pre-emptively dropping commits that will clash with #1183.

[speth]

I would prefer to drop the implicit YAML parsing that this introduces. Other than that, what's implemented here looks fine.

[ischoegl]

I would prefer to drop the implicit YAML parsing that this introduces.

@speth ... no problem: dropped. Also made some of the unit test method names more pythonic (i.e. switched to snake_case), but nothing else changed.

[speth]

Looks good to me. Thanks, @ischoegl!