[CR] Faster scrolling on look_around

I find the look around functionality lacking a faster way to scroll. We can already move the view offset 'faster' by changing the options for this, but not when you look around using 'x'. 

It is possible, in some cases, to use the mouse, but this is not optimal when you really work the game more or less completely from the keyboard.

This PR allows you to press 'f' (default key for Filter) to move the cursor by the move view offset option tiles, instead of one.