Scene painting, FINALLY! :D

This is probably the biggest thing that GameMaker users (which I was, years ago) have been missing from Godot. Tilemaps recently got you 80% of the way there but had all the limitations (and difficulties) associated with it.

So many good things in this release but scene painting is a big one, to me.

Some really cool stuff in this release. Godot keeps getting better and better.

Godot has left Unity eating dust. Wonderful to see all the hard work from contributors paying off. Congrats!

> Only download the templates you need

This is going to save me gigabytes of space :)