graphics: make clear RES zone appear as many 1x1 tiles
TileImage: s/drawTo/drawFragment
TileImage: make getSize(), so that drawTo() works with non-standard tile sizes
graphics: make RES letter slightly smaller
TileImage: fix getSize() of ScaledSourceImage
graphics: trees: make fancy trees on border of forest
TileImage: implement toString() for help in debugging
graphics: mapgen: make only one variety of border trees
graphics: trees: finish fancy border trees
TileImage: replace isAnimated with getLifeSpan