Migrate C++ array API

tests/str8/test_str8.cc

@@ -617,10 +617,10 @@ TestFuncResult test_str8_from_bytes(void) {
 
   Str8 str      = wapp_str8_buf(1024);
   Str8 expected = wapp_str8_lit_ro("WAPP");
-  U8Array bytes = wapp_u8_array('W', 'A', 'P', 'P');
-  wapp_str8_from_bytes(&str, &bytes);
+  u8 *bytes     = wapp_array(u8, 'W', 'A', 'P', 'P');
+  wapp_str8_from_bytes(&str, bytes);
 
-  result = str.size == bytes.count * bytes.item_size;
+  result = str.size == wapp_array_count(u8, bytes) * wapp_array_item_size(u8, bytes);
   result = result && wapp_str8_equal(&str, &expected);
 
   return wapp_tester_result(result);