[feature request] support tile images larger than map grid (for 2.5D)

[jmp909]

currently the plugin will not render overlapping tile images correctly (required for 2.5D)

also the "right up" rendering order from Tiled is required for this layout. (actually i have to do a custom sort on all tiles with tile.z = tile.y - tile.x anyway so rendering order may not matter)

thanks
j