New release 3.19

• added bold, italic and underline attributes to xterm256 ANSI output
• fixed assembler mapping in filetypes.conf
• added Swift definition
• improved ASP, F#, OCaml and Lisp syntax definitions
• added interpolation patterns to several definitions
• updated base URLs in cpp_ref_gtk_gnome and cpp_ref_qtproject plug-ins
• CLI: added Pango markup output option