0.1.1-beta.4

chore(server-url-placeholder): enVar for server objects

When importing a file and the server url is defined without the domain, requests that are imported are missing an origin, while the importer adds a substitute URL to make the request valid, it makes it hard for users to update multiple requests with the origin they prefer.

This commit addresses that issue, when an imported file does not have a valid URL, the importer creates an environment variable, and sets its value to https://echo.paw.cloud which is added to every request.