3.0.1

- add BSD 3 license
- change pages theme to material, add icons

- prepare new release
- always build pages, but only publish them on main

- prepare new release
- use version in Gradle snippets

- prepare new release
- finished styling of lists

- prepare new release
- begin to change styling of lists

- prepare new release
- finished with styling

- prepare new release
- update version

- prepare new release
- rewrite documentation after removing deprecated inclusion/exclusion

- prepare new release
- remove deprecated inclusion/exclusion

- prepare new release
- remove deprecated inclusion/exclusion

- prepare new release
- coherent styling of nodes and relation labels

- prepare new release
- coherent styling of nodes and relation labels

- internal restructure (methods for each kind of analysed method)

- fix tests after adding empty nodes

- add "?" to label for optional children and relations
- use "[]" for empty lists (styled like null-nodes)

- update version

- keep original indices of children when filtered (untested)

- add more documentation on using
- make filter method using regexes deprecated