As an admin, i should be able to have a page where i can add/edit global properties
- Adding and updating are already done, we need to support deleting a global property
- Exclude global properties with the .started and .mandatory suffixes from the manage global properties page.
- This feature wasn't written with angular+REST
- The manage global properties should list all global properties except those with .started and .mandatory suffixes and a user should be able to add/edit them successfully.