add Table
inline fun Group.addTable(background: Drawable = Styles.none, constructor: Table.() -> Unit = {}): Table
Adds a table to the group, passes it to the lambda and returns the created table.
inline fun Table.addTable(background: Drawable = Styles.none, constructor: Table.() -> Unit = {}): Cell<Table>
Adds a table constructed by a lambda to the existing table and returns the created table cell