Enhance Doxygen Documentation with Images for Lane Model

The new lane model has been introduced in #110 and the documentation has to be extended with proper pictures explaining the system in detail as well as to refine some cases as described in #156

[carsten-kuebler]

Or v3.0.1...

@carsten-kuebler: Are there any updates on this issue?

[carsten-kuebler]

@LudwigFriedmannBMW I add Documentation-and-figures-3.0.1 without the figures. If you give me feedback, you or I will add the figures.

@carsten-kuebler: Please add the pictures to the documentation.

[carsten-kuebler]

@LudwigFriedmannBMW I add the figures to the PR.

Issue solved with #266