Core: Move Vector2i to its own vector2i.h header

Also reduce interdependencies and clean up a bit.

modules/gdnative/gdnative/packed_arrays.cpp

@@ -32,7 +32,7 @@
 
 #include "core/variant/variant.h"
 
-#include "core/math/vector2.h"
+#include "core/math/vector2i.h"
 #include "core/math/vector3i.h"
 
 static_assert(sizeof(godot_packed_byte_array) == sizeof(PackedByteArray), "PackedByteArray size mismatch");

modules/gdnative/gdnative/rect2.cpp

@@ -32,6 +32,7 @@
 
 #include "core/math/rect2.h"
 #include "core/math/rect2i.h"
+#include "core/os/memory.h"
 
 static_assert(sizeof(godot_rect2) == sizeof(Rect2), "Rect2 size mismatch");
 static_assert(sizeof(godot_rect2i) == sizeof(Rect2i), "Rect2i size mismatch");

modules/gdnative/gdnative/transform2d.cpp

@@ -31,6 +31,7 @@
 #include "gdnative/transform2d.h"
 
 #include "core/math/transform_2d.h"
+#include "core/os/memory.h"
 
 static_assert(sizeof(godot_transform2d) == sizeof(Transform2D), "Transform2D size mismatch");
 

modules/gdnative/gdnative/vector2.cpp

@@ -31,6 +31,8 @@
 #include "gdnative/vector2.h"
 
 #include "core/math/vector2.h"
+#include "core/math/vector2i.h"
+#include "core/os/memory.h"
 
 static_assert(sizeof(godot_vector2) == sizeof(Vector2), "Vector2 size mismatch");
 static_assert(sizeof(godot_vector2i) == sizeof(Vector2i), "Vector2i size mismatch");