Improve drag and drop by supporting more file types & node types

Adds support for dragging in all files of type Texture2D for 2D.
Adds support for dragging in all files of type Mesh for 3D.
Replaces adding texture as Light2D with PointLight2D.
Add more node types that textures can be added as
- TextureButton
- CPUParticles2D

editor/plugins/node_3d_editor_plugin.cpp

@@ -4030,7 +4030,7 @@ bool Node3DEditorViewport::can_drop_data_fw(const Point2 &p_point, const Variant
 							continue;
 						}
 						memdelete(instantiated_scene);
-					} else if (type == "Mesh" || type == "ArrayMesh" || type == "PrimitiveMesh") {
+					} else if (ClassDB::is_parent_class(type, "Mesh")) {
 						Ref<Mesh> mesh = ResourceLoader::load(files[i]);
 						if (!mesh.is_valid()) {
 							continue;