Cleanup: Correct location of node function declarations

Currently there are many function declarations in `BKE_node.h` that
don't actually have implementations in blenkernel. This commit moves
the declarations to `NOD_composite.h`, `NOD_texture.h`, and
`NOD_shader.h` instead. This helps to clarify the purpose of the
different modules.

Differential Revision: https://developer.blender.org/D13869

source/blender/editors/render/CMakeLists.txt

@@ -28,6 +28,7 @@ set(INC
   ../../imbuf
   ../../makesdna
   ../../makesrna
+  ../../nodes
   ../../render
   ../../sequencer
   ../../windowmanager

source/blender/editors/render/render_internal.cc

@@ -56,6 +56,8 @@
 #include "BKE_scene.h"
 #include "BKE_screen.h"
 
+#include "NOD_composite.h"
+
 #include "DEG_depsgraph.h"
 
 #include "WM_api.h"

source/blender/editors/render/render_shading.cc

@@ -64,6 +64,8 @@
 #include "BKE_workspace.h"
 #include "BKE_world.h"
 
+#include "NOD_composite.h"
+
 #include "DEG_depsgraph.h"
 #include "DEG_depsgraph_build.h"
 

source/blender/editors/render/render_update.cc

@@ -49,6 +49,8 @@
 #include "BKE_paint.h"
 #include "BKE_scene.h"
 
+#include "NOD_composite.h"
+
 #include "RE_engine.h"
 #include "RE_pipeline.h"