Add SimplexNoise and NoiseTexture as new resources

SimplexNoise can be used to generate parameterized fractal noise based on Open Simplex.

NoiseTexture uses SimplexNoise to generate noise textures for using in
shaders/visual effects.

modules/opensimplex/config.py

@@ -0,0 +1,14 @@
+def can_build(env, platform):
+	  return True
+
+def configure(env):
+	pass
+
+def get_doc_classes():
+    return [
+        "NoiseTexture",
+        "SimplexNoise"
+    ]
+
+def get_doc_path():
+    return "doc_classes"