FreeGameDev

I made some of the textures better. here they are:

sorry, I think city_tree.jpg is not an improvement, it is a very low-resolution image that was scaled up and we can see big pixels and JPEG artifacts

wood.jpg is too small, it will appear either blury or repetitive in game; and the original wood.jpg texture was removed in STK SVN. We already have many bigger and better wood textures so I don't think we need this one. Thanks anyway

Regarding the logs, maybe, not sure, are there more opinions? A problem is that the 3 logs are identical, so obvious repetition patterns will be spotted when using this texture