added more vehicles

[severak]

added sizes of these objects:

• tram car - 14m based on https://en.wikipedia.org/wiki/Tatra_T3
• bus - 12m - based on https://en.wikipedia.org/wiki/Solaris_Urbino_12
• tractor - based on sizes of modern John Deer tractor (as found in local dealership manual)
• small airplane - based on https://cs.wikipedia.org/wiki/Cessna_172
• airplane - based on https://en.wikipedia.org/wiki/Boeing_737
• railway track (gauge) - 1435mm
• automobile - 4m - based on https://en.wikipedia.org/wiki/Fiat_Multipla
• trolleybus - 11m - based on https://en.wikipedia.org/wiki/%C5%A0koda_14Tr

note that size of the vehicles is their length