Entity Spawn Window Improvements

[southbridge-fur]

Adds some needed functionality to the entity spawn window.

• Includes a paste button next to the regular search field.
• Adds the ability to hover over an entity to see its prototype id
• Adds a button to copy the prototype id of the currently selected entity.
• Adds the ability to spawn a second item along side the current one, to spawn effects and the like.

https://github.com/user-attachments/assets/370ae1ea-55e8-4fb2-b521-a6cfbcdcac78

Gonna redo the UI to something more like this