Create a UI for parameterizing the piling config

[flekschas]

This is related to #46 and #47

Once we can import/export the piling config and we have defined the properties of the piling config we can easily build a UI for exploring the parameter space.

To do this efficiently, we can loop over the JSON schema and depending on the data type generate UI elements.

For example:

• for numerical values, we can create a slider
• for short string values, we can create a 1-line text input element
• for long string values, we can create a text area
• for categorical string values with 3 or fewer categories, we can create radio buttons
• for categorical string values with 4 or more categories, we can create a drop-down menu
• for boolean values, we can create a checkbox

[flekschas]

Partially addressed in #51