activates the selection keyboard navigation
webix.ui({
    view:"datatable",
    navigation:true,
    ...
});
The following keyboard commands are enabled:
| Command | Description | 
|---|---|
| Up arrow key | moves one cell (row) to the up | 
| Down arrow key | moves one cell (row) to the down | 
| Left arrow key | moves one cell (column) to the left | 
| Right arrow key | moves one cell (column) to the right | 
| Home | moves to the top left cell(row, column) in the grid | 
| End | moves to the bottom right cell(row, column) in the grid | 
| PGUP | scrolls the table up | 
| PGDN | scrolls the table down |