[Game Engine Checker] Add IGDB support

[s-crypt]

Extension name

Game Engine Checker

Feature Description

PCGamingWiki often cannot find the engine for a game and occasionally IGDB will have the engine. Would it be possible to support using IGDB to find the game engines used? It would be nice to choose a priority like metadata downloading, but searching for the engine on IGDB when PCGamingWiki does not return a result would do just fine.

Screenshots

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