<f:format.nl2br> not needed any more
Still a tweaks are needed.

- TLO (if exists) is added to spatial category 'Top level objects' which is placed on the top of type list

- adding typoScript group to routs
- adding typoScript group as argument to each tsref controller action
- adding typoScript groups to main menu and removing select box from side menu
- adapting backend calls to changed backend rest api routes
- removing section "Install SGalinski.TypoScriptReferenceFrontend to new project" from readme

- quick fix to remove error markings from phpstorm

This reverts commit a03cb3c9.

- also out commenting login form. Forger login form can be used.

- Catching exceptions and reporting them via flash messages in each controller action
- Reporting success via flash messages
- Checking response of typoScriptBackend web resource for errors and handling the errors
- Fixing AccessArrayViewHelper not to throw error if given array is null
- A try to convert Fluid flashMessages html to html which can be styled by Bootstrap

- types in side menu are sorted by categories
- a type can be assigned to a category through it's edit form

- Login form with login controller. Same as on forger package. Both login forms work.
- Configuration required for login in Setting.yaml.
- SGalinski.TypoScriptReference:Admin role defined in Policy.yaml. User must have this role if he wishes to edit the data.

- Added select box for TypoScript group, also adapting controller to filter by TypoScript group
- [BUGFIX] using decoded typo3Versions everywhere before rest backend call (decoded like this: 'all' => NULL, 'current' => 99999)
- Currently the app is little buggy - properties are not well filtered by versions

Filter by typScript group is implemented, but without select box to specify the value, normalGrouup is used as default filter value

This solution has a bug - content of downloaded xml file is doubled.
The content gets doubled after being set to FLOW response...