- Added displayName metadata field to prims
- Adjusted tests to test for and modify authored displayName metadata
- Did not add Get/Set DisplayName methods to prims - all access should
  be via Get/Set Metadata to keep ABI compatibility

- Added context menu item to show prim display names (default = True)
- Added support for showing prim display name in the prim tree
- Added support for searching on prim display name in search box
- Modified prim tree item tooltip to show both name and display name

- Augmented automated tests in usdview to account for displayName
- Added displayName to field keys in wrapPrimSpec
- Removed unnecessary comment blocks

- Moved displayName related methods from UsdProperty to UsdObject
- Adjusted tests to better conform to user search expectations

- Rolled back changes to search
- Updated condition to match on display name if authored or on name
  if not

- Ensured .ui file was saved from Qt designer

- Refactored out pattern match code into separate method to
  avoid code duplication across prim and prototype search paths
- Fixed documentation issue

- Adjusted usdview search matching logic to directly
  invoke GetDisplayName and compare to empty string
  to avoid overhead of calling HasAuthoredDisplayName
  followed by GetDisplayName

- Modified comments appropriately for methods moved to UsdObject
- Made checks for valid displayName more pythonic