Merge pull request #272 in VECTO/vecto-sim from ~EMKRISPMI/vecto-sim:feature/VECTO-323-pto-idle-losses to develop

* commit 'b8c89345':
  generic vehicle
  removed gearbox-auxiliary
  PTO Aux
  updated PTO generic vehicle, corrected error with PTOCycleFileBrowser
  vdri in vptoc
  separate writing json files
  surround opening files with try/catch; separate writing files to dedicated writer class, access values via inputdata interfaces
  refacotring: move writing files into separate class
  output of P_PTO_transm, P_PTO_consum in modfile
  added DataSourceType (was missing)
  Vehicle-File: added null values for empty entries of Angledrive and PTO
  changed PTO Cycle extension from "vdri" to "vptoc" (added new file browser)
  Changed Column header "Engine Speed" to "Engine speed" for PTO-related input cycles