Moved more includes from headers to cpp files.

editor/plugins/animation_blend_tree_editor_plugin.cpp

@@ -41,6 +41,7 @@
 #include "scene/gui/panel.h"
 #include "scene/gui/progress_bar.h"
 #include "scene/main/viewport.h"
+#include "scene/3d/skeleton.h"
 
 void AnimationNodeBlendTreeEditor::add_custom_type(const String &p_name, const Ref<Script> &p_script) {
 	for (int i = 0; i < add_options.size(); i++) {

editor/plugins/root_motion_editor_plugin.cpp

@@ -31,6 +31,7 @@
 #include "root_motion_editor_plugin.h"
 #include "editor/editor_node.h"
 #include "scene/main/viewport.h"
+#include "scene/3d/skeleton.h"
 
 void EditorPropertyRootMotion::_confirmed() {
 	TreeItem *ti = filters->get_selected();

editor/plugins/skeleton_ik_editor_plugin.cpp

@@ -31,6 +31,7 @@
 #include "skeleton_ik_editor_plugin.h"
 
 #include "scene/animation/skeleton_ik.h"
+#include "scene/3d/skeleton.h"
 
 void SkeletonIKEditorPlugin::_play() {
 	if (!skeleton_ik) {

scene/animation/animation_blend_space_1d.cpp

@@ -30,6 +30,8 @@
 
 #include "animation_blend_space_1d.h"
 
+#include "scene/3d/skeleton.h"
+
 void AnimationNodeBlendSpace1D::get_parameter_list(List<PropertyInfo> *r_list) const {
 	r_list->push_back(PropertyInfo(Variant::REAL, blend_position));
 }

scene/animation/animation_blend_tree.cpp

@@ -31,6 +31,7 @@
 #include "animation_blend_tree.h"
 
 #include "scene/scene_string_names.h"
+#include "scene/animation/animation_player.h"
 
 void AnimationNodeAnimation::set_animation(const StringName &p_name) {
 	animation = p_name;

scene/animation/animation_tree.cpp

@@ -30,6 +30,9 @@
 
 #include "animation_tree.h"
 
+#include "animation_player.h"
+#include "scene/3d/skeleton.h"
+#include "scene/3d/spatial.h"
 #include "animation_blend_tree.h"
 #include "core/engine.h"
 #include "core/method_bind_ext.gen.inc"

scene/animation/animation_tree.h

@@ -31,11 +31,12 @@
 #ifndef ANIMATION_GRAPH_PLAYER_H
 #define ANIMATION_GRAPH_PLAYER_H
 
-#include "animation_player.h"
-#include "scene/3d/skeleton.h"
-#include "scene/3d/spatial.h"
+#include "scene/main/node.h"
+#include "core/resource.h"
 #include "scene/resources/animation.h"
 
+class Spatial;
+class Skeleton;
 class AnimationNodeBlendTree;
 class AnimationPlayer;
 class AnimationTree;

scene/animation/skeleton_ik.cpp

@@ -36,6 +36,8 @@
 
 #ifndef _3D_DISABLED
 
+#include "scene/3d/skeleton.h"
+
 FabrikInverseKinematic::ChainItem *FabrikInverseKinematic::ChainItem::find_child(const BoneId p_bone_id) {
 	for (int i = children.size() - 1; 0 <= i; --i) {
 		if (p_bone_id == children[i].bone) {

scene/animation/skeleton_ik.h

@@ -38,7 +38,11 @@
  */
 
 #include "core/math/transform.h"
-#include "scene/3d/skeleton.h"
+#include "scene/main/node.h"
+
+class Skeleton;
+
+typedef int BoneId;
 
 class FabrikInverseKinematic {
 	struct EndEffector {