Separated color passes into separate modules.

Moved main JS into its own module.
Main module now builds passes into a pipeline, based on the value of config.effect.
The passes no longer make stubs when they're not meant to be active.
Asset loading has been moved into the passes, which resolve their ready promise when they've finished loading.

TODO.txt

@@ -1,6 +1,8 @@
 TODO:
 
 Clean up config.js
+  Too many responsibilities
+    Pass-specific properties should be made into uniforms in the passes
 
 Reach out to someone about producing sounds
   Raindrop sound