Add support for styling lines and shapes in Select One from Map questions

[seadowg]

As a form designer
I want to specify the color and width of lines in selectable lines and polygons
So that data collectors can more easily select the correct one

Forum thread · Issue for markers · Simple style spec

Note: in the future, we will likely introduce a rule-based way to assign colors based on other property values. This is a simple short-term solution that is useful in many contexts.

Stroke color

• Given that I have a form definition with a select from map
  And that a choice that is either a line or a polygon has a value set for a property with name stroke
  And that the value is valid based on the criteria below
  When I open the select from map question
  Then the line segments for that option should all be the specified color

• Given that I have a form definition with a select from map
  And that a choice that is either a line or a polygon has a value set for a property with name stroke
  And that the value is invalid based on the criteria below
  When I open the select from map question
  Then the line segments for that option should all be the default color

• Given that I have a form definition with a select from map
  And that a choice that is either a line or a polygon has no value set for a property with name stroke
  When I open the select from map question
  Then the line segments for that option should all be the default color

Stroke width

• Given that I have a form definition with a select from map
  And that a choice that is either a line or a polygon has a value set for a property with name stroke-width
  And that the value is a floating point number greater than or equal to 0
  When I open the select from map question
  Then the line segments for that option should all have the specified stroke width in dp

• Given that I have a form definition with a select from map
  And that a choice that is either a line or a polygon has a value set for a property with name stroke-width
  And that the value is NOT a floating point number greater than or equal to 0
  When I open the select from map question
  Then the line segments for that option should all have the default stroke width

• Given that I have a form definition with a select from map
  And that a choice that is either a line or a polygon has no value set for a property with name stroke-width
  When I open the select from map question
  Then the line segments for that option should all have the default stroke width

Fill

• Given that I have a form definition with a select from map
  And that a choice that is a polygon has a value set for a property with name fill
  And that the value is valid based on the criteria below
  When I open the select from map question
  Then the polygon for that option should be filled with the specified color and default opacity

• Given that I have a form definition with a select from map
  And that a choice that is a polygon has a value set for a property with name fill
  And that the value is invalid based on the criteria below
  When I open the select from map question
  Then the polygon for that option should be filled with the default color and default opacity

• Given that I have a form definition with a select from map
  And that a choice that is a polygon has NO value set for a property with name fill
  When I open the select from map question
  Then the polygon for that option should be filled with the default color and default opacity

Color rules

// Colors can be in short form:
// "#ace"
// or long form
// "#aaccee"
// with or without the # prefix.
// Colors are interpreted the same as in CSS,
// in #RRGGBB and #RGB order.
// But other color formats or named colors
// are not supported