Implement page turner controls

[jabrah]

• [x] First - go to first page
• [x] Prev - go to previous page
• [x] Next - go to next page
• [x] Last - go to last page
• [x] Goto - go to arbitrary page according to label or number
• [ ] Fullscreen - make viewer full screen

[jabrah]

I currently don't know how to use the "fullscreen" plugin through the JS interface.