Changed all locations in code where a string is coerced into a double or vice versa, and substituted new macros (in ugens.h) which support 64-bit compiles (for which string pointers are the size of a long long).  These macros will switch automatically based on gcc's built-in macros.  No 64-bit support for non-Gnu builds yet.
Changed all locations in code where a string is coerced into a double or vice versa, and substituted new macros (in ugens.h) which support 64-bit compiles (for which string pointers are the size of a long long).  These macros will switch automatically based on gcc's built-in macros.  No 64-bit support for non-Gnu builds yet.

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