Team templates shipped with the engine.

  <name>.pptx     timeline templates for create_timeline(template="<name>"): a one-slide deck holding a
                  timeline (save_template writes one to %LOCALAPPDATA%\OfficeTimelineMCP\templates).
                  Lanes / tasks / milestones of a new timeline whose title matches one in the template
                  start from its styling; the template's logo and other shapes are kept.
  <name>.otltplx  the add-in's own Custom Templates; copied into Documents\Lucen Timeline\Templates the
                  same way team themes are installed (new, or newer version of the same Id).
