[#243] Nicer REPL for morley-debugger
Description
Problem: morley-debugger reads command line-by-line, without any prompts or feedback. Therefore it seems that it hangs after each command, since there is no visual reaction that the command was processed.
Solution: add a "morley> " prompt to repl. Also handle EOF (Ctrl-D) as graceful exit.
Related issue(s)
Resolves #243 (closed)
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