formalize file/folder evaluations; use set-types for files/folders so that we can evaluate both file metadata & contents, rather than just assuming the contents; adjust slice view rule to just expand to the contents, rather than achieving the slice with a changed type

src/eval/generated/eval.meta.c

@@ -139,7 +139,7 @@ E_OpInfo e_expr_kind_op_info_table[51] =
 { E_OpKind_Null, 0, str8_lit_comp("=>"), str8_lit_comp(","), str8_lit_comp("") },
 };
 
-U8 e_kind_basic_byte_size_table[57] =
+U8 e_kind_basic_byte_size_table[56] =
 {
 0,
 0,
@@ -197,10 +197,9 @@ U8 e_kind_basic_byte_size_table[57] =
 0,
 0,
 0,
-0,
 };
 
-String8 e_kind_basic_string_table[57] =
+String8 e_kind_basic_string_table[56] =
 {
 str8_lit_comp(""),
 str8_lit_comp("void"),
@@ -257,7 +256,6 @@ str8_lit_comp("class"),
 str8_lit_comp("enum"),
 str8_lit_comp("bitfield"),
 str8_lit_comp("variadic"),
-str8_lit_comp("space_ptr"),
 str8_lit_comp("set"),
 };