Save, Fuel and Descriptions — SailSim Steam update #1360788

In this update i reworked the Throttle interface for the Keyboard and Mouse controls as well as Touch (if someone is using it). Additionally there is a more detailed hint in the beginning of each adventure. Also i added AutoSave and "Continue" to the Adventures so you can resume at the last checkpoint. Furthermore, i increased the fuel range so that the challenges are a bit easyer and there is more room for error.