Feature: get table content

[pavigor]

This PR allow access to table content. It can be useful in case when you need to replace one table to another without creating any time new table.

package main

import (
	"github.com/gdamore/tcell/v2"
	"github.com/rivo/tview"
)

func main() {
    grid := tview.NewGrid().SetRows(2, 0).SetColumns(3, 0).SetBorders(true)
    var table *tview.Table
    table1 := tview.NewTable().SetBorders(true)
    table1.SetCell(0, 0, tview.NewTableCell("DataTable1")
    table1.SetCell(0, 1, tview.NewTableCell("DataTable1"))
    table2 := tview.NewTable().SetBorders(true)
    table2.SetCell(0, 0, tview.NewTableCell("DataTable2")
    table2.SetCell(0, 1, tview.NewTableCell("DataTable2"))

    // Tree
   treeView := tview.NewTreeView()
   root := tview.NewTreeNode("Root")
   node1 := tview.NewTreeNode("Node1").SetColor(tcell.ColorGreen)
   node1.SetSelectedFunc(func() {
        // Dynamic update table content
	table.SetContent(table1.GetContent())
   })
   node2 := tview.NewTreeNode("Node1")
   node2.SetSelectedFunc(func() {
        // Dynamic update table content
	table.SetContent(table2.GetContent())
   })
   root.AddChild(node1).AddChild(node2)
   treeView.SetRoot(root).SetCurrentNode(root)

   grid.AddItem(treeView, 0, 0, 2, 2, 0, 0, true)
   grid.AddItem(table, 0, 2, 2, 2, 0, 0, false)

   if err := tview.NewApplication().SetRoot(grid, true).SetFocus(grid).Run(); err != nil {
	panic(err)
    }
}

[rivo]

https://github.com/rivo/tview/blob/master/CONTRIBUTING.md:

Start all sentences upper-case [...] and end them with a period.

Also, I think you mean "the table's current content."