New File Browser in beta

We've been working for quite a while on our new file browser. It's close to being done and we wanted to get it out there for you to try. You can access it under `Site Manager -> File Browser (beta)`. We are still polishing it a little, but please try it out and let us know if you have any feedback. When we release the final version we'll have it fully integrated with the editor, file upload fields, and image upload fields.