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File I/O and other Directives

Added #fopen, #fclose, #read, and #write directives for user text files.

Added #undef identifier directive. Un-declares previously declared identifier. Works on locals or globals.

Added requirement that any directive which can end in a float or expression must be terminated by a semi-colon. Specifically this means any #declare or #local of float, vector or color or the #version directive.



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