json_encode(object) was returning empty braces "{}"

For the menu on the left, only type names and ids are fetched. When a type is clicked, more data is shown about the type in right part of the page. By typeId, additional type data is fetched (including properties).

Bootstrap and Forger use lover cased css name.

Important notice: uriPattern: '{@controller}(/{@action})' exists also in Forger package, and that makes conflict. To solve it, SGalinski.TypoScriptReferenceFrontend routes should be included in main Routes.yaml file before forger routes. And it should be prefixed in main Routes.yaml file like this: uriPattern: 'ts/<SGalinski.TypoScriptReferenceFrontend>'