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This update makes better use of the Enum class capabilities
and reduces the code to something simpler and clearer.

**WARNING** not all asset types can be forked.
This will fail accordingly.

**WARNING** not all asset types have version support.
This will fail accordingly.

**WARNING** not all asset types can be created from scratch.
This will fail accordingly.

This wasn't following the asset name properly

This method will return the full path to the json file for
a given asset name.

This is valid for assets like database and protocol template

This will allow to more easily execute validation.

Updated tests

Also made the enum unique so that there's no way to have two
same values in it.

This will make the enum itself more usable. Style wise, this makes
it an independent element of AssetModel.

Values of variables where wrong

Jaden authored Jan 19, 2019 and Samuel GAIST committed Oct 04, 2019

Fixes #190

This class can be used to retrieve a list of available assets.

Currently returns only the highest version available for assets
that are not experiments.

This model can be used, for example, to populate the content of
combo boxes when there's a need to show a list of available
dataformats.