Frontend cleanup

[joel99]

Have a more state controlled frontend, remove the white box that holds webcam. Build in a mechanism to allow short circuiting the backend (see the short circuit branch) to allow skipping of style transfer.

• Test scrolling of filter section on a few different browsers (scrollbar was gone on chrome in new linux box).
• Consider substituting in a static photo (style image sources) to tease style instead of showing filtered photo in filter list