Implement keyboard map panning (map scrolling)

[due2e]

Adds the ability to scroll the map using WASD and →↓←↑ arrow keys.

[t-wy]

Some updates:
It seems that wplace has its own default keybinds: (Check the source code of 4.(hash).js near {panStep:100,bearingStep:15,pitchStep:10})

• 61, 107, 171, 187 (+ or =/+): zoom in
• 189, 109, 173 (- or -/_): zoom out
• 37 (←): move left (+shift: rotate clockwise)
• 39 (→): move right (+shift: rotate anti-clockwise)
• 38 (↑): move upwards (+shift: tilt up, probably not for 2D map)
• 40 (↓): move downwards (+shift: tilt down, probably not for 2D map)

As ↑←↓→ may conflict with the rotations, and their default "move" that only accepts a single axis direction is quite dumb, I may be just keeping the wasd part as an option for better panning.
Also, per request I am moving the options to the user settings which is off by default. Make sure to select so for map panning to work.

[due2e]

Great catch on that fix! Thanks for the update 👍