Improved map preview

[penfriendz]

better idea of what tech buildings are on minimap
instead of star, have oil derrick, oil refinery, reinforcement pad, etc show up

[ImTimK]

Maybe unrelated, but in loading screen preview. Instead of a player number, it would be nice to have a team number and army icon.

[xezon]

This should be an issue report, with enhancement label - if it does not yet exist.