WIP: Tolerate Unknown Fields in Responses#1425
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When a client built against an older Tiled release talks to a newer server that has added a field to a client-side dataclass (Asset, DataSource, Spec, AwkwardStructure, TableStructure, ContainerStructure, ...), the client previously crashed with `TypeError: unexpected keyword argument` because `Structure.from_json`, `DataSource.from_json`, and `Spec(**...)` splatted the payload directly into the dataclass. Add a small `filter_known_kwargs` helper in `tiled.structures._compat` that drops unknown keys and logs them at DEBUG. Wire it into `Structure.from_json`, `Asset.from_json` (new), `DataSource.from_json`, and `Spec.from_json` (new), and update the two `Spec(**spec)` call sites in `tiled.client.base` to use `Spec.from_json`. The server continues to strip fields for known-broken client versions via the User-Agent gate, but this makes the client resilient to any future additions without requiring a server-side back-compat entry.
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Tolerate unknown fields on the client side when decoding server JSON into
Asset,DataSource,Spec, and structure dataclasses (AwkwardStructure,TableStructure,ContainerStructure). Unknown keys are dropped and logged at DEBUG so a client can talk to a newer server without crashing on fields it does not recognize.Related Issue: #1426
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