WI-19483 Internal Webserver: Necessary to restart PhpStorm to change PHP interpreter
IDEA-111342 Gradle: if root project is renamed by means of gradle, it is shown twice in tool window - as root project and as sub-project

1. Correctly update cached data at ExternalSystemFacadeManager on project rename;
2. Minor refactoring (method rename);
3. Drop obsolete data from 'local external system settings' on project rename;
4. Update external tool window project node representation on project rename;