Copy fake EpicGamesLauncher.exe for games flagged with env variable

[arielj]

This PR depends on having the legendary binary from: Heroic-Games-Launcher/legendary#13

How to test:

• Install GTAV or RDR2 or any rockstar game
• configure the custom legendary binary from the link above
• make sure the game is NOT configure with the fix.bat workaround
• set an env variable for the game USE_FAKE_EPIC_EXE=true
• launch the game

---

Use the following Checklist if you have changed something on the Backend or Frontend:

• Tested the feature and it's working on a current and clean install.
• Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• Created / Updated Tests (If necessary)
• Created / Updated documentation (If necessary)

[arielj]

I think this file is small enough and shouldn't really require changes in the future often, I think it's safe to include it in the build directly to make it simpler