fix(IO): enable export of signed/unsigned 8/16-bits attributes to Paraview

Author: yo35

include/geode/basic/attribute_utils.hpp

@@ -258,11 +258,14 @@ namespace geode
     }
 
     IMPLICIT_GENERIC_ATTRIBUTE_CONVERSION( bool );
+    IMPLICIT_GENERIC_ATTRIBUTE_CONVERSION( signed char );
+    IMPLICIT_GENERIC_ATTRIBUTE_CONVERSION( unsigned char );
+    IMPLICIT_GENERIC_ATTRIBUTE_CONVERSION( short );
+    IMPLICIT_GENERIC_ATTRIBUTE_CONVERSION( unsigned short );
     IMPLICIT_GENERIC_ATTRIBUTE_CONVERSION( int );
     IMPLICIT_GENERIC_ATTRIBUTE_CONVERSION( unsigned int );
     IMPLICIT_GENERIC_ATTRIBUTE_CONVERSION( float );
     IMPLICIT_GENERIC_ATTRIBUTE_CONVERSION( double );
-    IMPLICIT_GENERIC_ATTRIBUTE_CONVERSION( local_index_t );
 
 #define IMPLICIT_ARRAY_GENERIC_ATTRIBUTE_CONVERSION( Type )                    \
     template < size_t size >                                                   \