Add 'InfinityLoader.exe' as an option to the Launch button

[CamDawg]

Ever since it's been added, I've loved the launch game button in NI and use it regularly when I'm testing stuff. When I'm modding a game with EEex installed, It would be great if I could launch infinityloader.exe from the launch button instead.

InfinityLoader.exe should only be present if EEex is installed, so it would be nice to have an invisible change from the game exe > InfinityLoader.exe, but I'd happily settle for a dropdown option like the bgmain/baldur options you get for the originals.

[Argent77]

The game launcher can already be customized via bookmark options.

In the "Game executable" section one or more executables can be defined. Adding InfinityLoader.exe should be enough. NI falls back to the default game executable if the loader doesn't exist.