Upgrade to C++17 [CMake] (#4717)

* Make our CMake slightly less insane

src/Generating/CMakeLists.txt

@@ -1,5 +1,6 @@
+target_sources(
+	${CMAKE_PROJECT_NAME} PRIVATE
 
-SET (SRCS
 	BioGen.cpp
 	Caves.cpp
 	ChunkDesc.cpp
@@ -29,9 +30,7 @@ SET (SRCS
 	VerticalLimit.cpp
 	VerticalStrategy.cpp
 	VillageGen.cpp
-)
 
-SET (HDRS
 	BioGen.h
 	Caves.h
 	ChunkDesc.h
@@ -66,8 +65,3 @@ SET (HDRS
 	VerticalStrategy.h
 	VillageGen.h
 )
-
-if(NOT MSVC)
-	add_library(Generating ${SRCS} ${HDRS})
-	target_link_libraries(Generating fmt::fmt OSSupport Blocks Bindings)
-endif()

src/Generating/FinishGen.h

@@ -15,6 +15,8 @@
 
 
 
+#pragma once
+
 #include "ComposableGenerator.h"
 #include "../Noise/Noise.h"
 #include "../ProbabDistrib.h"