TEIIDDES-2062 added a IProject.isOpen() call to prevent visiting closed model projects
TEIIDDES-2061
* Added validation rule to create warning if char length is > 1
* Added checks in property source to prevent changing the length if == 1 for char datatypes. Includes columns and parameters.
* Logging warning if user tries to change the length == 1 property value in properties view or Table Editor
* Checking char types and length in JDBC importer to change char to String type if length > 1