Updated Help Documentation

Latest help doc update describing new tools, issues & changes, etc.
Download KML & Upload GPX, Highlighted Areas Labels

Added two new tools to the Map Center:
- Download Highlighted Area as KML (appears after a hunt area is
highlighted)
- Upload Waypoints & Tracks (add a GPX file to the map)
Highlighted hunt areas are now labeled.
The legend window was given a light gray background to better see yellow
symbology.
Updated Help Documentation

Updated help doc.