Add KtFieldSlider

[killakalle]

Is your feature request related to a problem? Please describe. As an AMPI admin user I want to be able to use sliders as an input field for choice properties, so that users easily recognize when choice values are related.

Describe the solution you'd like

• Slider for choice properties
• Slider has a name/title/main label
• Slider value labels are displayed in the same order as property choice values
• Users have the possibility to unselect/unset/delete/clear slider input
• Slider value labels arrange nicely to avoid overlapping of slider value labels in case of
  • long label names
  • many labels
  • small/narrow screen
• Slider value labels must not be bigger as slider title label (see screenshot below, where the value labels are actually bigger than the property label)

Additional context Sliders are already being used in AMPI forms

Example of a slider in AMPI

[FlorianWendelborn]

~~Closing as duplicate of #39~~

No longer a duplicate, as the original issue has been closed by the author