Add dynamic exposure correction (#12959)

* Add uniform for frame delta time
* Adjust exposure in logarithmic (EV) space
* Add network support and LUA API
* Add testing mod

src/CMakeLists.txt

@@ -375,6 +375,7 @@ set(common_SRCS
 	itemdef.cpp
 	itemstackmetadata.cpp
 	light.cpp
+	lighting.cpp
 	log.cpp
 	main.cpp
 	map.cpp