Management tooling - catalog preview

[lukashornych]

We want to create a new tab similar to server status that will

• display catalog statistics and properties
• provide easy access to actions (create catalog, back up, ...)
• list all entity collections with actions on them and click-through to entity viewer
• link to catalog schema

This will be available using context menu on catalog or clicking the catalog item in the explorer tree. This means that clicking the item in the explorer will not expand the item but will open new tab. Expanding will be possible only through the left-side arrow.