WIP game object thumbnails in graphs
Refresh object thumbs when scene saved
Node icon tweaks
https://files.facepunch.com/ziks/2024-09-30/sbox-dev_6XFZEVyCvd.mp4
More scene.ref node icon tweaks
https://files.facepunch.com/ziks/2024-09-30/HZYdyW9buu.png
Frame scene ref target on double-click
https://files.facepunch.com/ziks/2024-09-30/sbox-dev_Fb3jaAbxNS.mp4