[REQUEST] Add AutoCat support for Engine

[MichaelHinrichs]

Is your feature request related to a problem? Please describe.
I'm always frustrated when I want to update my collections, because I organize them by engine, for modding and asset extracting.

Describe the AutoCat you'd like
Game engine and other software.

Describe how this can/should happen
SteamDatabase/FileDetectionRuleSets
Rules to detect game engines and other technologies based on Steam depot file lists.

yretenai/SteamFiles.
A C# Library to use SteamDatabase's File Detection rulesets.