BUBBLESIG -- show bubble box and user signature with profile picture icon

• Syntax: %BUBBLESIG{WikiName}% or %BUBBLESIG{WikiName - YYYY-MM-DD}%
• The parameter can be either just the WikiName of a user, or by convention the WikiName followed by a dash and the date
• Example:
  -- %BUBBLESIG{TWikiGuest - 2024-04-24}%
• Expands to:
  -- TWiki Guest - 2024-04-24
• Category: EditingAndContentUpdateVariables, FormattingAndRenderingVariables, UsersAndAuthenticationVariables
• Related: USERREPORT, USERSIG, UserList, UserReports