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Add quasiquoting and reader prefix macros

Tara McGrew requested to merge topic/default/qq into branch/default

This adds a new QQ package to the standard library, which when USEd, changes the backtick character ` to a "quasiquote" as seen in more modern Lisp derivatives.

`<FOO ~.BAR>

is equivalent to



`<FOO ~!.BAR>

is equivalent to


The ` and ~ prefixes are implemented with another new package, READER-MACROS, which is built into ZILF. We still don't have a full implementation of read tables, but READER-MACROS could be changed to use read tables if they're added someday.

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