title: add properties of QLineEdit to QTable Widget in Qt
body: <p>I want to add a <code>Table Widget</code> in my application. But some properties which I want are not supported for <code>Table Widget</code>, but are available for <code>QLineEdit</code>.
  For example <code>Validator</code>, <code>PlaceHolderText</code>, etc properties from <code>QLineEdit</code>. I want to have these properties for individual cells of <code>Table Widget</code>. I don't want to add <code>QLineEdit</code> in my <code>GUI</code>, only <code>Table Widget</code>.
  Is it possible to do this?
  Thank You.</p>