Add hotkeys, document hotkeys, make 'DefaultGUI' runnable via NodeJS, generate hotkey documentation

Docs/Hotkeys.md

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+
+ Hotkeys 
+=========
+
+
+
+## Table of contents
+
+1. [Hotkeys](#hotkeys)
+
+
+
+MapComplete supports the following keys:
+
+
+
+Key combination | Action
+----------------- | --------
+B | Opens the Background, layers and filters panel
+Escape | Close the sidebar
+L | Pan the map to the current location or zoom the map to the current location. Requests geopermission
+M | Switch to a background layer of category map
+O | Switch to a background layer of category osmbasedmap
+P | Switch to a background layer of category photo
+ctrl+F | Select the search bar to search locations
+shift+O | Switch to default Mapnik-OpenStreetMap background
+ 
+
+This document is autogenerated from