Add an Eliza clone as included app for basis of NPC "AI"

[oubiwann]

See:

• http://lisp.plasticki.com/show?24GC
• http://lisp.plasticki.com/list?24NX
• http://interweave-consulting.blogspot.com/2017/02/so-this-is-where-we-are-doctor.html
• https://sites.google.com/view/elizagen-org/the-original-elizas