Move scriptapi to separate folder (by sapier)

On the lua side, notably minetest.env:<function>(<args>) should now
be replaced by minetest.<function>(<args>).
The old way is and will stay supported for a long time.

Also:
Update and clean up lua_api.txt (by celeron55)
Move EnvRef to lua and remove add_rat and add_firefly (by kahrl)
Add separate src/util/CMakeLists.txt, other minor fixes (by kahrl)

src/CMakeLists.txt

@@ -206,6 +206,9 @@ configure_file(
 	"${PROJECT_BINARY_DIR}/cmake_config.h"
 )
 
+add_subdirectory(script)
+add_subdirectory(util)
+
 set(common_SRCS
 	rollback_interface.cpp
 	rollback.cpp
@@ -222,22 +225,6 @@ set(common_SRCS
 	itemdef.cpp
 	nodedef.cpp
 	object_properties.cpp
-	scriptapi_types.cpp
-	scriptapi_common.cpp
-	scriptapi_content.cpp
-	scriptapi_craft.cpp
-	scriptapi_node.cpp
-	scriptapi_item.cpp
-	scriptapi_env.cpp
-	scriptapi_nodetimer.cpp
-	scriptapi_noise.cpp
-	scriptapi_entity.cpp
-	scriptapi_object.cpp
-	scriptapi_nodemeta.cpp
-	scriptapi_inventory.cpp
-	scriptapi_particles.cpp
-	scriptapi.cpp
-	script.cpp
 	log.cpp
 	content_sao.cpp
 	emerge.cpp
@@ -283,12 +270,8 @@ set(common_SRCS
 	staticobject.cpp
 	serverlist.cpp
 	pathfinder.cpp
-	util/serialize.cpp
-	util/directiontables.cpp
-	util/numeric.cpp
-	util/pointedthing.cpp
-	util/string.cpp
-	util/timetaker.cpp
+	${SCRIPT_SRCS}
+	${UTIL_SRCS}
 )
 
 # This gives us the icon
@@ -365,6 +348,7 @@ set(minetestserver_SRCS
 
 include_directories(
 	${PROJECT_BINARY_DIR}
+	${PROJECT_SOURCE_DIR}
 	${IRRLICHT_INCLUDE_DIR}
 	${ZLIB_INCLUDE_DIR}
 	${CMAKE_BUILD_TYPE}
@@ -375,6 +359,7 @@ include_directories(
 	${SQLITE3_INCLUDE_DIR}
 	${LUA_INCLUDE_DIR}
 	${JSON_INCLUDE_DIR}
+	${PROJECT_SOURCE_DIR}/script
 )
 
 if(USE_FREETYPE)