Fix ScriptInterface developer mode settings not applying.

Minor changes:
- clean out some Lua functions registered twice
- Correct bool cast in quad_setSegs()
- Show nested mains in debug console
- One less //HACK comment

BBGE/Core.cpp

@@ -2746,8 +2746,6 @@ void Core::setMousePosition(const Vector &p)
 // used to update all render objects either uniformly or as part of a time sliced update process
 void Core::updateRenderObjects(float dt)
 {
-	//HACK: we may not always be assuming virtual 800x600
-	Vector cameraC = core->cameraPos + Vector(400,300);
 	for (int c = 0; c < renderObjectLayers.size(); c++)
 	{
 

BBGE/SoundManager.cpp

@@ -483,7 +483,6 @@ std::string SoundManager::getVolumeString()
 		musicChannel2->getVolume(&musicChannel2Vol);
 
 	os << "curMusVol (c1/c2/g): " << musicChannelVol << " " << musicChannel2Vol << " " << musicGroupVol << std::endl;
-	os << "runInBG: " << core->settings.runInBackground << std::endl;
 	return os.str();
 }