A tiny map and optimizations

This patch adds the 15th map to Andalia: "Valley of Death". It is a simple two-players map at which the competing players are connected via a single valley between them. All battles will be condensed to this narrow area, hence the name "Valley of Death".

Additionally this patch changes the material shaders of the map ground, the mountains and various environmental assets to be vertex shaders rather than pixel shaders thus greatly reducing the shader instructions and relieving the burden on the graphics card.

This is all for now. I hope you like this patch.

Happy playing!