References to path items are not treated correctly

[tfesenko]

Problem

com.reprezen.swagedit.core.model.Model.find(String) always returns null for path items.
Why is that:

• Model.nodes is a table which uses un-encoded JsonPointers as the keys, e.g. /paths/~1test~1{id}
• Model.find look-ups the Model.nodes using encoded JsonPointers for path items, e.g. #/paths/~1test~1%7Bid%7D

Symptoms

The symptoms below are true for reference to path items with { or }

1 You can use a reference to a path item anywhere and the validator will be OK with it.

Example:

---
openapi: "3.0.0"
info:
  version: "1.0.0"
  title: Test API
  
paths:
  /test/{id}:
    get:
      summary: Read
      description: Provide details for the entire list (for collection resources) or an item (for object resources)
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                # This is a reference to the parent path item,
                # but i should be a reference to a schema!!!
                $ref: "#/paths/~1test~1%7Bid%7D"

2 operationRef shows a validation error when operation path has { or }

At the same time, if you try to use a reference to child operation in a valid context as a value for operationRef, it creates an error about an incorrect type:

---
openapi: "3.0.0"
info:
  version: "1.0.0"
  title: Test API
  
paths:
  /test/{id}:
    get:
      summary: Read
      description: Provide details for the entire list (for collection resources) or an item (for object resources)
      responses:
        '200':
          description: OK

components:
  links:
    myLink:
      # A valid ref creates an error
      operationRef: "#/paths/~1test~1%7Bid%7D/get"