added graphical selector for some entities and fixed some issues

[Vegita2]

Added New graphical selection widget for some entities:

Prop

ScalableProp

Enemy

ItemDestruct

other changes

• Updated Phaser to 3.60.0
• Entity copy/paste now uses the clipboard to make it easier working with multiple editor instances use clipboard for entity copy #267
• All Prop Entities should now be rendered correctly
• Improved ScalableProp rendering. ends are now rendered correctly.
• Releasing mouse button outside the canvas now properly triggers. Avoids having issues like continue dragging entities even if the mouse button was released

[2767mr]

Things I noticed:

• A loading indicator would be nice
• Search should include sub types (with toggle?)
• Perhaps it would look better if this is centered?
  
• I think this could use some extra margin-right
  
• There is no good way to see the full name of the character now. In my other projects I usually do text-overflow: ellipsis with a tooltip containing the full text. This would clash with the existing tooltips here but maybe we can figure something out.
  
• Creating a new ScalableProp creates a 1x1 px entity (was already the case before this PR)
• I thought about opening the prop picker after double clicking props but that would probably be a bit much. Maybe opening it after creating a new prop would be nice?

Things I really liked:

• The "transparent texture"
• The size change on hover
• The red outline
• The counter in the top right of the props
• The prop rendering. That one has bothered me for a long time.

[Vegita2]

I thought about opening the prop picker after double clicking props but that would probably be a bit much. Maybe opening it after creating a new prop would be nice?

We could always trigger the double click when adding a new entity, but not sure if it's always the first thing you want to do. I would keep it like it currently is for now and decide later with some user feedback. It could also be toggleable in the settings menu

• Perhaps it would look better if this is centered?
  
• A loading indicator would be nice
• Search should include sub types (with toggle?)
• I think this could use some extra margin-right
  
• There is no good way to see the full name of the character now. In my other projects I usually do text-overflow: ellipsis with a tooltip containing the full text. This would clash with the existing tooltips here but maybe we can figure something out.
  
• Creating a new ScalableProp creates a 1x1 px entity (was already the case before this PR)

[lexisother]

Can this be made to scroll down to the selected prop/enemy/destructible when you open the modal again?

[Vegita2]

@lexisother made a new issue for it #277