Enhancement @ window move with arrow keys: move greater distance if shift is pressed

Common information

Window movement can be triggered via Alt+Space -> M. The window can then be moved around with arrow keys.

Current Situation

On larger screens the amount a window gets moved per one click can be perceived as too small.

Suggestion

If the user clicks shift+arrow key the window movement is greater.

Patch (for master)

0001-Enhancement-keyboard-window-move-Allow-greater-movem.patch (shift => travel 5 times the distance)

( I tried to be consistent and implement it for resizing as well, but resizing turned out to already be buggy, so I left my hands off of that )

Misc

I can remember, there was also a user on a mailing list (xfce?xubuntu) asking for that feature. The request was turned down with the cause being something like "we're not a system, that is made for keyboard use". This sounded like a "I don't want to implement it" to me, so I suggest the behaviour again, here.