A few fixes and small improvements

Release v1.5 which introduces cargo aircraft and a number of small fixes

Various fixes and a new mini feature to develop towns on the other station side

Fix an issue with a global variable

Fix some issues related to town building

Fix an issue with highways

Improve the geometry of junctions and crossovers, various fixes

Release version 1.4, several new features and multiple fixes

Allows the station length to be set

Fix an issue created in the previous update