Bundled Everything engine

Files:
- Everything.exe: voidtools Everything portable x64, version 1.4.1.1032
- es.exe: voidtools Everything Command-line Interface x64, version 1.1.0.30
- Everything.lng: language file from the Everything portable zip

Source:
- https://ftp.voidtools.com/en-us/downloads/

Notes:
- ES requires the Everything engine to be running.
- install_l4n.ps1 starts the bundled portable Everything before querying es.exe.
- If Everything cannot index the target disk because of permissions or first-run delay, the script falls back to Steam library detection and a built-in filesystem search.
