Remove rowData and rowID props, use data and key

CHANGELOG.md

@@ -80,6 +80,9 @@ All notable changes for each version of this project will be documented in this
         Use `IgxGridToolbarComponent`, `IgxGridToolbarHidingComponent`, `IgxGridToolbarPinningComponent` instead.
     - **Breaking Change** - The `rowSelected` event is renamed to `rowSelectionChanging` to better reflect its function.
     - **Breaking Change** - The `columnSelected` event is renamed to `columnSelectionChanging` to better reflect its function.
+    - **Breaking Change** - `rowData` and `rowID` properties are removed. Use `data` and `key` instead. Use `ng update` for automatic migration.
+    - **Breaking Change** - `columnsCollection` is removed. Use `columns` instead.
+    - **Behavioral change** - `columns` getter may now return an empty array [] in certain occasions, when grid is not yet renderd, but code is calling `grid.columns`. If this introduces behavioral changes or bugs, use `grid,columnList`. To get a column at specific index, use `grid.columnList.get(0)`
 - `igxGrid`
     - Exposed a `groupStrategy` input that functions similarly to `sortStrategy`, allowing customization of the grouping behavior of the grid. Please, refer to the [Group By ](https://www.infragistics.com/products/ignite-ui-angular/angular/components/grid/groupby) topic for more information.
 - `IgxColumnActionsComponent`