Overwatch

### SteamDB link to the game https://steamdb.info/app/273110/ ### What should it be detected as? Engine.GoldSource

You can find the steps below: https://docs.flathub.org/docs/for-app-authors/verification/

Fix sign out button

2

Currently, the "Sign out" button doesn't actually log the user out. It merely sets text. This PR allows the user to log out using Firebase auth.

### SteamDB link to the game https://steamdb.info/app/22350/ ### What should it be detected as? Engine.idTech

Add EntisGLS engine

2

### SteamDB app page links to a few games using this - [Primal Hearts](https://steamdb.info/depot/1359401/) - [I Walk Among Zombies Vol. 0](https://steamdb.info/depot/1132721/) - [I Walk Among Zombies Vol. 1 (Adult Version)](https://steamdb.info/depot/942851/)...