Martin Dobias d3e81f6d18 [FEATURE] Add support for shading of terrain
This adds new options for user to choose how the terrain should be rendered:
- shading disabled - color of terrain is determined only from map texture
- shading enabled - color of terrain is determined using Phong's shading model,
  taking into account map texture, terrain normal vector, scene light(s) and
  terrain material's ambient+specular colors and shininess

(configuration of lights is not there yet - now we always have a single point
light with white color at the middle of the scene at 1km above the zero elevation)
2018-11-11 16:10:58 +01:00
..
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