bushes buildable over water

[733737]

trees have a flag that prevents them from being built on top of water. This flag should be applied to all bushes except the lilypad, including tropical bushes. I don't know if this flag is stored in the json or if it hardcoded to trees. If this is hardcoded, maybe we could change the flag so it could be implemented on a per object basis including for other objects besides trees or bushes; such as the time twister rock n roll vehicle objects.