Add / extend game detection support for Epic Games (Heroic Games Launcher)

[ZashIn]

• Add detection of Epic Game Store games installed via Heroic Games Launcher.
• Fix detection for EGS installed games (synced in ProgramData)
• Add Unofficial EGS ID DB to the README
• Add EGS IDs to: Subnautica Below Zero, Cyberpunk, Control

Note: games with different savegame paths, like existing Subnatica support, would require an exposed API for correct path selection, e.g. via .gameVariant()