Add Nuclear Engine detection

[DmitriyBatkovich]

SteamDB app page links to a few games using this

https://steamdb.info/app/2116280/

Brief explanation of the change

Adds detection for Nuclear Engine, a custom TXC game engine/runtime used by Lady of Dreams.

The detection uses filename-based markers shipped in the depot:

• NuclearEngine.dll
• Assets/Engine/nuclear-engine.json
• Assets/Engine/NuclearEngine.marker

Local tests pass with php tests/Test.php.

[SteamDB-Tracker]

After running changed rules in this pull request (this bot only tests rules.ini changes):

Changed technologies: Engine.Nuclear_Engine

These apps now match: (1) 2116280

Please confirm that all these changed apps are correct.

[DmitriyBatkovich]

After running changed rules in this pull request (this bot only tests rules.ini changes):

Changed technologies: Engine.Nuclear_Engine

These apps now match: (1) 2116280

Please confirm that all these changed apps are correct.

Confirmed. The changed app is correct: 2116280 is Lady of Dreams, and Nuclear Engine detection is intended for this depot.