Improved Scenario Cutout

[rakow]

This PR improves the scenario cutout and adds functionality to remove invalid link ids from a population.

• New PersonNetworkLinkCheck class
  • When links are removed from a network, all occurrences of it must be removed from the population or the simulation will most likely crash.
  • Some previously existing classes only check network routes, but this implementation checks all routes and activities as well.
• The CreateScenarioCutOut writes a lot less network change events, by only writing events when an actual change in speed has occurred.