[DRAFT][SuperTextField] Support light and dark mode

[foxtrotravi]

NOTE: This is a work-in-progress PR that fixes issue #1598

Here is the progress made so far on this PR:

• Toggleable light mode and dark mode, which is respected by the SuperTextFields
• Start with a single text field of a single line. Make it possible to add more SuperTextFields in a vertical column.
• Make it possible to select a SuperTextField and alter various characteristics in a settings pane, e.g., line count, border color, etc.
• Adapts the overall layout for mobile vs desktop

Before

After