Changed import workflow

-Rearrange favorites in fs dock with drag and drop
-Removed import -> sub-scene, moved to scenetree contextual menu
-Removed import -> re-import , moved and integrated to FS dock
-Added ability in FS dock to re-import more than one resource
simultaneously
-Added ability to drag from native filesystem explorer to Godot, only
works on Windows though
-Removed scene reimport merge options, never worked well. Eventually
merging materials should be re-added
-Added ability to set custom root node type when importing scenes
-Re-Import is now automatic, can be configured back to manual in editor
settings
-Added resource previews in property list for many resource types

scene/scene_string_names.cpp

@@ -176,4 +176,11 @@ SceneStringNames::SceneStringNames() {
 	path_pp=NodePath("..");
 
 	_default=StaticCString::create("default");
+
+	for(int i=0;i<MAX_MATERIALS;i++) {
+
+		mesh_materials[i]="material/"+itos(i);
+	}
+
+	_mesh_changed=StaticCString::create("_mesh_changed");
 }