ImageRenderer cannot determine eye on camera_reborn

[reinago]

Small TODO: when frontend can again report which eye is active, get that info to determine which files to load. Zhe current hack is just for getting it to compile:
bool rightEye = false;

[geringsj]

Who tells the frontend which eye is currently rendered? Is there one MegaMol process per eye? Then we can put the active eye into the GlobalValueStore. The powerwall used to do this:

https://github.com/UniStuttgart-VISUS/megamol-examples/blob/073f6922bc937597874cfe038a8c04d958ec5af0/powerwall/powerwall_config.lua#L147-L153