[PATCH] Add map preview for 39 maps

[Yordan Grigorov]

Added a map preview for the following maps:

Skirmish:

Barcania (3) Corithian Isthmus (4) Skirmish Demo Two seas (6)

Random:

Mainland New RMS test Sahel Survival of the Fittest Wall Demo

Scenario:

Base Temperate Map Bridge Demo Campaign Map - Test Combat Demo Combat Demo (Huge) Eire and Albion Fishing Demo Flight Demo Flight Demo 2 Gorge Introductory Tutorial Miletus Multiplayer Demo Pathfinding Terrain Demo Reservoir Resource Demo Road Decals Demo Sandbox - The Carthaginians Sandbox - The Iberians Ship Formations Ships Demo Strategic Campaign Proof of Concept Territory Demo The Persian Gates Trading Demo Tropical Island Units Demo Walls WallTest We Are Legion

This is my first contribution to this game and I have never used trac before so I might have done something wrong

CC-BY-SA 3.0.