Scripting canvas

[PhaserEditor2D]

Allow a kind of visual programming in the scene editor.

We can introduce a Script Canvas, which is part of the Scene Editor. The Scripting Canvas will show the objects and the script nodes with a tree-like layout. The script nodes are rendered as cards and you should be able to edit its properties in the same place and add more script nodes and user components.

The events sheet of Construct 3 is an inspiration.