Links and arrangement in object structures

[FKlopfer]

Describe your changes

• Add links to the table of content that bring the user directly to the respective section. This needs to be done for all classes (vehicle, human and road network).
• Sort the individual elements within one hierarchy level in alphabetical order. This entails changing the order in the structure overview (table of content) and also the order of the corresponding sub-sections.
• And let's rename the section "Table of content" to "Structure overview" because it actually represents more than just a toc because it also shows the hierarchy levels.

Issue ticket number and link

Add a reference to a related issue.