Major string_view refactor. Added namespace sv

luprex/core/cpp/gui.cpp

@@ -1,7 +1,7 @@
 #include "wrap-string.hpp"
 #include "wrap-map.hpp"
 #include "wrap-vector.hpp"
-
+#include "util.hpp"
 #include "gui.hpp"
 #include "luastack.hpp"
 
@@ -62,7 +62,7 @@ LuaDefine(gui_menu_item, "action,label", "add a menu item to the current gui") {
     LuaStack LS(L, laction, llabel);
     eng::string action = LS.ckstring(laction);
     eng::string label = LS.ckstring(llabel);
-    if (!util::has_prefix(action, "cb_")) {
+    if (!sv::has_prefix(action, "cb_")) {
         luaL_error(L, "menuitem callbacks must start with cb_");
     }
     gui->menu_item(action, label);