[Feature] Add keybinding options for 'Next/Previous Category'

[qyurila]

What is your feature request?

JEI has 'Next/Previous Recipe Category' keybinding options, and lacking it is the only thing preventing me from using REI. It's not just 'JEI can do this' thing, I see it would improve the user experience when implemented.

What do you think this change is of?

• [ ] Visual
• [ ] Recipe Lookup
• [ ] Cheat Mode
• [ ] Plugin Integration / JEI Plugin Compatibility
• [X] Others