Much needed Improved Zipline construction.

[realrobd]

Making my first Zipline yesterday I discovered some unfortunate failings.

When in the Zipline creation UI where you choose the destination, there should be an elevation indicator that displays whether your intended target is higher or lower than the starting point. And by how much.

The Zipline Anchor should be moveable before and after creation. How this was overlooked is beyond me. To add to that, if the line is shorter after moving, no line materials are refunded. But if the line is longer, Silk Rope must be added.

[Wendy Winchester]

What I want to see is the grass automatically removed along the path of a zipline. Currently you have to build cross map ziplines insanely high in order to not get knocked off during your trip. It's extremely annoying.