Show how to use a tree table

[BobdenOs]

sap.ui.table.TreeTable:

This example shows how to use the TreeTable control using CAP.

How does it work:

• It uses the OData v2 proxy as UI5 does not support Tree Bindings on v4 models
• By using the @sap.hierarchy annotations it is possible to inform UI5 of what kind of Tree information is inside the column
• The model defines all required columns for the TreeTable to function and uses native CDL to achieve these results.
• The level information only is required for determining root entries. All children are fetching using the parent relation.