[perl #132452] Unicode: Windows shells print garbage instead of "｢｣"

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# New Ticket Created by  Dan Zwell 
# Please include the string:  [perl #132452]
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# <URL: https://rt.perl.org/Ticket/Display.html?id=132452 >


The Windows command shells I've used (CMD and Cmder) fail to print the "｢｣"
that are part of stringified matches. This is a significant issue, since
new users use regular expressions when working through tutorials.

Since pasting these characters into the console will also yield garbage, I
suggest we pick different symbols, like "┘┌", instead. (IMO, it's important
to choose two symbols that will not blend together when showing an empty
match.)

The current output:
> say 'a' ~~ /./
｢a｣

Note: I'm using the October 2017 Rakudo release.