extensions and roofs can now cover the whole platform length, for better visual symmetry + some minor fixes

fixed some glitches

introduce overpasses and improve the automatic links between platforms

Lifts can now be raised or lowered with <m> and <n>. There is also a bugfix for thin bridges colliding with lifts, which could make the station uneditable.

bugfix

bugfix: cannot build station on map with too few objects

better track crossings

fix track crossing when falling into track crossing

some usability updates