Use Decodable for `HomeItem` model class

[nabby26]

Context

The existing codebase in Revert is using custom protocol Collectable and struct CollectableGroup to decode data from the property list file into a model class that extends the protocol. This approach would require some maintenance work needed if the newer Swift version introduced and breaks the custom protocol and struct.

Fortunately, Swift Decodable API can easily decode data from property list file into a model class, as long as the model just extends Decodable and no extra configuration needed.

About this PR

This PR contains changes to replace HomeItem model class extension from Collectable to Decodable. The changes apply to both Revert iOS app and tvOS app.

Changes

• New data source class A new data source class that is compatible with Decodable model and its purpose is eventually to replace existing data source class.
• Updated property list structure Some property list files for Homeitem are getting structure update to ensure that the file is able to be decoded to HomeItem model
• Clean up unused classes and files Some property list files and model classes are no longer used in the codebase and getting removed.

What's next

• Convert the rest of model classes in Revert to extend Decodable
• Replace the existing DataSource class with the new one.
• Remove protocol Collectable and struct `CollectableGroup.

[nabby26]

Thanks for the feedback everyone! Got some valuable points here. I think for now I will just merge the code. Any issues for the name changing will be addressed on future PRs.

[tonyarnold]

Great work, Nabby! Thanks for the effort and time you put into this.