v2.16.3

• Bugfix release:
  • Do not kill X11 apps whose pop-ups don't support WM_DELETE_WINDOW
  • When the layout of the texture disagrees with the layout of the output surface, then the clip area needs to be modified. (Fixes: #3201)
  • [graphics platforms] Allow for multiple RenderingPlatforms of each type (Fixes: #3205)