Templates for Schema Object Properties

[tedepstein]

When positioned to insert a new property, here:

Code assist inserts _key_:

And this produces an error marker with a message that is not very helpful:

Multiple markers at this line

• value of type string is not allowed, value should be of type object
• 2 added lines

It would be helpful to have templates for various kinds of properties that can be added to a Swagger Schema Object.

[tedepstein]

Related issue: #227