message: Add StorableResources operator*
diff: struct StorableResources
  {
  + constexpr StorableResources operator*(int multiplier) const
  + {
  + StorableResources result = *this;
  + for (size_t i = 0; i < resources.size(); ++i)
  + {
  + result.resources[i] *= multiplier;
  + }
  + return result;
  + }
  +
  constexpr StorableResources& operator+=(const StorableResources& other)
  {
  for (size_t i = 0; i < resources.size(); ++i)
  