Change the apparent texture brightness of emitters based on their intensity

Currently, if emitters are set to be very intense, the lighted area around them will outshine the emitter itself, when it should be the other way around. The apparent brightness of the emitter should change with the emitter intensity to be more realistic.

Start by locating the emitter rendering and intensity-handling entry points in the Java path tracer, then compare the emitter's apparent brightness with the illuminated area around it. Done means highly intense emitters no longer appear dimmer than the lighted area and their apparent brightness changes consistently with intensity.

Written by the indexing model from the issue text.