New HSR RULs

A lot more stable and now can do underpasses under C1,C4,C5 curve, Also dragging a switch next to a curve merges nicely as well two cruves next to each other(where there should be 2 C1s on the same tile), with support for underpasses too. And draggable diagonal underpasses. RHW overpasses have RULs but don't work currently.