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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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