Support custom property types for a specific Entity

[Kobee1203]

This issue follows on from issue #182

Add a new ParserOptions to override types of a property for a specific Entity.

public final class ParserOptions {

   ...

    private Map<String, List<String>> customPropertyTypes;
}

A property may be used for multiple entities, and may have multiple types.

The goal is to be able to override types of a property for one or multiple entities:

Example when we change the types of schema:geoCoders, whatever the Entity:

schema:geoCoders=schema:Text,schema:Place,com.example.GeoPosition

OR without `schema:` prefix:
geoCoders=schema:Text,schema:Place,com.example.GeoPosition

Example when we change the types of schema:geoCoders for a specific Entity:

schema:Place.schema:geoCoders=schema:Text,schema:Place,com.example.GeoPosition

OR without `schema:` prefix:
Place.geoCoders=schema:Text,schema:Place,com.example.GeoPosition

Update com/weedow/schemaorg/generator/model/handler/PropertyModelHandlerImpl.java to handle this option.