make sure newest version of active tile is sent to client
allow clicking through turn markers (for tower outlines)
do tower checks after new tile is put into placed tiles so that index can be sent from client without a special case for the active tile
draw tile images and followers/overlay in separate groups so that every follower is always entirely on top of all tile images
find the first meeple by x position and not first added to always find small meeples before large ones
add frontend code to allow tower placement instead of meeple placement (without meeple capture)