* upgrade to api version 4
* set bike pushing speed to 4km/h and add mode change penalty
* set cycleways for two-way and one-way roads according correctly
* add changelog
* adjust tests according to change of the walking speed
* adjust tests according to new behaviour of opposite, track and lane in one-ways
* refactor the cycleway identification
* comment to understand weird counterintuitive testcase
* adjust sliproad test because walking speed is now slower
