Allow for complex inputs

[viktor-rick]

Is your feature request related to a problem? Please describe.
The following list doesnt work yet:

• AutodeskFileField
• ChildEntity-Fields
• ColorField
• DateField
• Entity-Fields
• FileField (see Allow for File Fields #3)
• GeoPointField
• GeoPolylineField
• GeoPolygonField
• GeometrySelect-Fields
• HiddenField
• MultiSelectField
• SiblingEntity-Fields
• TextAreaField

Describe the solution you'd like
I'd like to (when possible) test for all VIKTOR fields

Dev notes
Most have not been done due to first getting feedback on viktor-cli test. Generally this can be divided into Entity fields and 'normal' fields, where the latter is easy to implement. Entity fields will probably work like filefields