Procedural planet prototype 3 - Playing with water

The procedural planet generation journey continues. The main advancement from the previous iteration was that of my first foray into messing around with shaders, trying to get the water to look more watery. Messing about with the water shader became something of a theme after this, as I was never quite satisfied. I've also published a [full write-up of the project](https://ambimist.com/doings/procedural-planets-in-godot-3/).