The SimpleModel is used to to read simple data models from YAML that require no further processing
This allows us to delete several models that re-use the same code.
In the new data model, some field operate as keys for other parts of the model.
This now performs some validations and will throw an error if fields are missing.
For example: a Game must have an Engine, but does not require datafiles
With YAML being a very flexible format, it would be good to have some consistency with how it is formatted. Flathub is a pretty commonly used repository and has good YAML guidelines, so I think it's good to reflect them.
Fixes the following Codacy issues:
* Avoid variables with short names like `$a`. Configured minimum length is 3.
* Avoid unused local variables such as '$key'.
Since it appears that #110 will require compatibility data to be changed from XML to YAML, I wanted to practice and change a simpler page from XML to YAML. If merged, I'm willing to convert other pages as well (e.g. Links, Press Articles, Screenshots, FAQs) as well
Le Philousophe
Thunderforge
Mataniko
Eugene Sandulenko