Column header - Change column name

As a user, I want to be able to easily change the name of any given column

Acceptance Criteria
ON HOVER
The following visual signifier is displayed:

• Textbox outline

ON CLICK

• The textbox is active. Cursor appears. Text becomes editable.
• Other icons/signifiers are still in view but displayed as not active (if applicable)

• The name change is confirmed when the user hits "enter" or clicks out of the text box
• When the name is confirmed
  • The text box no longer looks active
  • No cursor is displayed