Vehicle type definitions

[paulheinr]

The following features are added with this PR:

• Read vehicle definitions file

• 41 qsim uses max vehicle speed if present

• in case of routing, it can handle three types of plans. Types 1 and 2 are extended to type 3. Legs are kind of a placeholder and specific routes and walk leg distances will be computed during the simulation.
  1. main activity -> main activity
  2. main activity -> main leg (with mode) -> main activity
  3. main activity -> walk -> interaction -> main leg -> interaction -> walk -> main activity
• mode specific routing