implement the panelLayout_callback
the callback is now defined for a certain panelLayout-key
the callback is now named "panel_callback"
fixed typos
enable assigning fields to different filter panels
updated changelog with the two new features (panel_callback, filter assignment)
Optimize filterPanel callback to follow Contao Core
cs
cs
fixed wrong reference in panels variable
Merge branch 'hotfix/3.0.4'
Fix the `.gitattributes` file
Add the "slider" content element
Add the english labels of the content slider elements
Indent all content elements inbetween two wrapper elements
Add the version 3.1 update to adjust the database
Add a CHANGELOG entry before merging the branch
Merge branch 'feature/content-slider' into develop
Remove redundant comments from the `moo_` templates
Correctly load the language files (see #5384)