add moonphases that alter the brightness of night. tweak torch and sky lightmap curves a bit

shaders/lib/ROBOBO_sky.glsl

@@ -95,7 +95,8 @@ vec3 sky_transmittance(vec3 position, vec3 direction, const float steps) {
 vec3 calculateAtmosphere(vec3 background, vec3 viewVector, vec3 upVector, vec3 sunVector, vec3 moonVector, out vec2 pid, out vec3 transmittance, const int iSteps, float noise) {
 	const int jSteps = 4;
 
-	
+
+
 	vec3 viewPosition = (sky_planetRadius + eyeAltitude) * upVector;
 
 	vec2 aid = rsi(viewPosition, viewVector, sky_atmosphereRadius);