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PL0

A moderately refactored version of N. Wirths PL/0 Pascal implementation.

• Changed to use file given on command line instead of reading stdin.
• Divided to units: main, defs, parser, codegen, interpreter.
• Added textual error messages to parser (in addition to error number)
• Added ? (read) and ! (write) functionality.
• Changed some variable and constant names to be (imo) more understandable.
• Project files for Lazarus included.