[Parrot] #172: get rid of C-strings for STRING_TYPE constants in PIRC

[Parrot]

#172: get rid of C-strings for STRING_TYPE constants in PIRC
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 Reporter:  kjs     |       Owner:  kjs             
     Type:  todo    |      Status:  new             
 Priority:  normal  |   Milestone:                  
Component:  pirc    |     Version:                  
 Severity:  medium  |    Keywords:  c-string, STRING
     Lang:          |       Patch:                  
 Platform:          |  
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 strings are stored in PIRC as c-strings, just arrays of bytes. I should
 get rid of my stubbornness, and just convert c-strings immediately to
 STRINGs in the lexer.

 (It might even simplify some code)

 This is necessary as PIRC needs some functionality that only deals with
 (or returns) STRINGs, not char *.

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Ticket URL: <https://trac.parrot.org/parrot/ticket/172>
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