partial transition to new flexible watch table structure; more work on 'set' types; checkpoint before replacement of old view-rule-hacks with proper-eval-system support for sets/collections/etc.

src/eval_visualization/eval_visualization_core.c

@@ -115,6 +115,7 @@ ev_type_key_and_mode_is_expandable(E_TypeKey type_key, E_Mode mode)
        kind == E_TypeKind_Union ||
        kind == E_TypeKind_Class ||
        kind == E_TypeKind_Array ||
+       kind == E_TypeKind_Set ||
        (kind == E_TypeKind_Enum && mode == E_Mode_Null))
     {
       result = 1;