Trim Display Handle Whitespace

[wilwade]

While it doesn't effect lookup due to the canonical handle, Display handles should be cleaner.

• Remove all whitespace from the leading and trailing end of a display handle
  • this is a display handle -> this is a display handle
• Collapse all whitespace to just one if duplicated
  • this is a display handle -> this is a display handle

Notes

• Do not modify existing handles. They can remain
• Watch out for loop cost. Might be worth adding in with another loop such as ban loop for @#etc..