[0.5.8] Support SkyBox Mod! — Alive Desktop Steam update #564580

Update content New features: In editing mode, you can hold down the left button to select multiple objects. New features: The right-click menu supports multiple selection of objects. New features: Support skybox type Mods (only the last one added is valid), subscribe to Midgard Skybox Give it a try: Development log: Since trying to personally implement various functions of the editor, I will no longer easily curse Unity for being terrible (because it is really too troublesome).