Added limited support for reader macro extensions.
<MAKE-PREFIX-MACRO!-READER-MACROS!- !\$ ,PREFIX-$> will register a prefix macro, such that $FOO will be replaced with the value returned by <PREFIX-$ FOO> at read time. <MAKE-PREFIX-MACRO!-READER-MACROS!- !\$ <>> will remove the previously registered macro. Partly addresses ZILF-181.
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