feat(properties): implement counterType config property

[e11sy]

Problem

For now we can't customize counters for ordered list

Solution

Added counterType customisation in toolbox

Now we support:

• numeric (default)
• lower-roman
• upper-roman
• lower-alpha
• upper-alpha

Changes

NestedList

• In constructor we check that list is ordered and if it is, we assign default value to the data.counterType if it is not specified
• Export customisation toolbox items into toolbox
• Change data.counterType value when related toolbox triggered

Tabulator

• Change own data.counterType and set list's --list-counter-type to the concrete value, when NestedList calls changeCounterType() method
• On save, check, if list is ordered and add counterType to the dataToSave variable

Styles

• Added variable that is responsible for list counter type

Types

• Added union type that represents supported values for data.counterType
• Added Map that is responsible for getting exact counterType by it's name displayed in toolbox item