extract debugging code to internal/debugging module

src/logic/scripting/lua/lua_util.cpp

@@ -155,18 +155,18 @@ static int l_error_handler(lua_State* L) {
 }
 
 int lua::call(State* L, int argc, int nresults) {
-    int handler_pos = gettop(L) - argc;
+    int handlerPos = gettop(L) - argc;
     pushcfunction(L, l_error_handler);
-    insert(L, handler_pos);
+    insert(L, handlerPos);
     int top = gettop(L);
-    if (lua_pcall(L, argc, nresults, handler_pos)) {
+    if (lua_pcall(L, argc, nresults, handlerPos)) {
         std::string log = tostring(L, -1);
         pop(L);
-        remove(L, handler_pos);
+        remove(L, handlerPos);
         throw luaerror(log);
     }
     int added = gettop(L) - (top - argc - 1);
-    remove(L, handler_pos);
+    remove(L, handlerPos);
     return added;
 }