Utilize new class ToolboxFile in core.
Optimize file templates, add new alternative template
re-add handling of RenderSettingAttribute::get handling which got lost in 4c60367989955800aabce31605c1602232dc37c2.
Add a new function "Use file picker".
Hide file picker support when multiple has been set.
Hide file picker support when multiple has been set.
Add w50 class to optimize the dca listing
The config now does "deep assignments"
See https://github.com/MetaModels/core/issues/193
Add the eval/multiple to getFieldDefinition().
Merge branch 'origin/dev'