[enhancement] Add the keys of keyboard for control

[signalk]

[enhancement] Add the keys of keyboard for control

[panaaj]

In the current version the keyboard cannot be used to zoom / scroll the map, this is due to the user experience being made a little inconsistent by the fact that keystrokes are only sent to the map it has focus.
So you get the experience where:

• after the application loads the keys to scroll/pan don't work (map does not have focus)
• click on the map and the keys to scroll/pan will work
• open a menu, etc and the keys to scroll/pan don't work (map loses focus)
• you need to click back on the map for them to work again.

I'd expect that a user who prefers to use the keyboard would be frustrated if they did not work consistently after all menu and dialog interactions.

[tkurki]

But isn't all this fixable?

• focus on map on load and when menus etc are closed
• close menus etc with Escape key

[panaaj]

Added to v1.60 release

[free-x]

Super! Thx a lot!