Create A Model Extension Definition (MED) Eclipse Editor

Create a GUI MED editor using Eclipse resource editor framework. This editor be used to edit "*.mxd" files. In addition, this editor should:

• not allow editing of readonly *.mxd files
• inform user of implications of changing MED (could result in deletion of model object properties)
• should saving the new MXD editor add to the registry or should there be "Add to registry" button?
• should allow "Save As"
• "Save" should validate using the MED parser and registry methods
• "Save" should NOT automatically update registry (which causes side-effects). Should have another way of updating registry.

Stretch goals:

• change to a multi-tabbed editor that would add a "Source" or textual view of MXD file
• support for the Eclipse Outline View
• support the MXD content that has i18n features