Script to update REFERENCE.md with hyperlinks to gnome-shell js source files

[blackjackshellac]

Added a script to update REFERENCE.md with hyperlinks to the source file in the gnome-shell sources.

GNOME_SHELL_JS="https://github.com/GNOME/gnome-shell/tree/master/js"

Finds links in ui and misc sections, as well as subdirs components and status.

Some of the js files no longer exist in the gnome-shell js directories but most still work.