Rail building changes kovarex

The problem with rail building is that it has too many states. It depends whether you start building the rail with shift, to use the ghost mode or not, and then it also matters whether you still hold shift, to ignore trees or not. Moving from manual building to ghost rail building means cancelling the whole rail building and starting it again with the correct modifier.

The problems were reaching the surface from time to time, and Twinsen even drew a nice little state diagram of the rail building system.

It kind of peaked with this bug report. After some time, it became clear that we should simplify it.

This is a nice example, where we can talk about change we just released (0.17.29) in a FFF.

From now on, instead of 3 modes (building manually, ghost building, ghost building + tree/rock removal), we have only 2 modes, where the ghost building without obstacle deconstruction is not available anymore. So it doesn't matter anymore how you star...