Add vim like arrow, scroll, and close filtering motions

[mehmetumit]

With this pull request, some of the key controls discussed in #129 will be implemented.

• Adding configurable keybindings for up/down arrows ( k and j vim motions can be used as alternative to up/down arrows) Thanks to @gwendolyngoetz for implementing this feature #499
• Add configurable keybindings for left/right arrows ( h and l vim motions can be used as alternative to left/right arrows)
• Add u and d keys for page up/down alternatives ( I didn't want to replace default ctrl+u toggle-unmodified-files keybinding so I usedu and d like Vimium extension )
• Add esc key to close filtering( Implemented a new method by utilizing the existing toggle filter method, without touching its current behavior)

Additionally, once awesome-gocui/keybinding#5 is merged, it will be possible to use characters like ö, ü, / . As a result, #129 and #415 issues will be completely solved.

[mehmetumit]

Is there any update? Could you please take a look when you get a chance, @wagoodman ? Let me know if there's anything else you need from me.