Create test artefacts using online graphical editor

[costas80]

Test artefacts are created offline as archives of XML files and used assets. Structural validation using the GITB XSDs is of course possible but leaves significant room for errors concerning the defined content. A graphical editor to simplify test case authoring, allow for resource lookup and reuse and, very importantly, validate results, would significantly streamline test case development.

Note: This task is considered as one of significant complexity that would need to be broken down further. As, such it is marked as an EPIC.