Add a Uniform object for RandomAlgorithm

This object contains several random numbers for the GPU kernel to use when generating random points. This isn't right yet (there are still patterns in the generated data) but it's time to move on...

Terrain2/Renderer.swift

@@ -151,6 +151,9 @@ class Renderer: NSObject, MTKViewDelegate {
 
     private func updateGameState() {
         /// Update any game state before rendering
+        if iterateTerrainAlgorithm {
+            terrain.algorithm.updateUniforms()
+        }
 
         uniforms[0].projectionMatrix = projectionMatrix