kirst25's sandbox: Style fields

The Style fields module adds field widgets for selecting color or spacing
options.

It also includes field formatters to add the field as a css class or inline
style to the entity.

CONFIGURATION

1. Add a list (text) field - Note: The key will be used as the class.
2. Configure the form display to use Spacing or Color widgets.
3. [Optional] Configure the manage display to use class of style formatters.

---

EXAMPLES

BG color lists:

List (text) field with:

--c-primary|#cbd7a6
--c-red|#e66363
--c-blue|#bdc7e1

Or:

primary|#cbd7a6
red|#e66363
blue|#bdc7e1

Set widget display as "Color options" and define the colors.
There's an option in the formatter display to set a prefix for the class option eg. .bg--.
---

Spacing fields:

Separate margin-top, margin-bottom, padding-top, padding-bottom list (text)
fields with:

mb--s|S
mb--m|M
mb--l|L

But also as mt, pb, pt.

Set widget display as "Spacing options" and select the correct type.