Map: Height Maps

[DRG]

From the README file

### Getting the terrain
+
+After picking a good location so that all areas of interests are covered by the map click the Download button. Generating the
+map will take about half a minute but you can continue to use the UI while waiting. When the source map is generated it should
+be copied to game directory tiled "Maps". It will be map number 999 and will be overwritten by autosave if you work with any
+other map in the WinSPMBT map editor.
+
+After opening the map go to second page of tools (either by clicking the blue triangle or "n" key on your keyboard) and choose
+clear keeping the current contour. Do not click on any hex but choose then Fill range button and enter 255 in. Then press the
+fill button and the terrain should be finished.