More effects

[Dmunch04]

Effects like shake and zoom would be nice

[qwergle]

I've been digging through Astrofox's code a bit, and it seems that you'd need to write a GLSL shader in src/shaders/glsl, add a JS wrapper in src/shaders/, and write a JS effect in src/effects/ so that it can be controlled by the user. Then, you'd have to add an import for your effect to src/shaders/index.js. You'd also need to add an icon in src/view/assets/images/.