Use std::size instead of sizeof(a) / sizeof(a[0]) pattern throughout the codebase.

core/error/error_list.cpp

@@ -30,6 +30,8 @@
 
 #include "error_list.h"
 
+#include <iterator>
+
 const char *error_names[] = {
 	"OK", // OK
 	"Failed", // FAILED
@@ -82,4 +84,4 @@ const char *error_names[] = {
 	"Printer on fire", // ERR_PRINTER_ON_FIRE
 };
 
-static_assert(sizeof(error_names) / sizeof(*error_names) == ERR_MAX);
+static_assert(std::size(error_names) == ERR_MAX);