Font: Should create Text item with specified font when dragged to navigator or form editor.

Shader: Should create Shader item when dragged to navigator. If target of the drag is a Shader object, update it instead. Don't allow drag if Quick3D is not imported.

Images with more than one frame: Create AnimatedImage instead of Image.

Sound files: Create SoundEffect if QtMultimedia is imported. Don't allow drag in not. If target is a SoundEffect, update it instead.