CC @Timple

Distance to goal integrating path points rather than just L2 distance.

ETA based on some conservative metrics (max speed or min speed, current speed?)

Brief feature description

The units::Duration class could have same additional features and improvements.

Detailed information

• rename the creation methods like milliseconds to fromMilliseconds
  • some getter methods should then be renamed, e.g. milliSeconds -> milliseconds or toMilliseconds
  • no final decision, please ask before starting with this
• c