title: Change value column header in TableView JavaFX
body: <p>I am trying to create a TableView in JavaFX where the user can change the value of the column header by double clicking on the table header.
  A Textbox should appear and after filling in a new value, the value should be assigned to the column header.</p>
  
  <p><a href="https://i.stack.imgur.com/aVMvU.png" rel="nofollow noreferrer">Example of output below</a></p>