message: Move `MaxCapacity` constant to unnamed namespace
diff: namespace
  {
  const int MineFacilityStorageCapacity = 500;
  +
  + const StorableResources MaxCapacity{
  + MineFacilityStorageCapacity / 4,
  + MineFacilityStorageCapacity / 4,
  + MineFacilityStorageCapacity / 4,
  + MineFacilityStorageCapacity / 4,
  + };
  }
  @@ -65,15 +72,9 @@ void MineFacility::think()
  return;
  }
  - static const StorableResources capacity{ MineFacilityStorageCapacity / 4,
  - MineFacilityStorageCapacity / 4,
  - MineFacilityStorageCapacity / 4,
  - MineFacilityStorageCapacity / 4
  - };
  -
  if (isIdle() && mMine->active())
  {
  - if (storage() < capacity)
  + if (storage() < MaxCapacity)
  {
  enable();
  }
  @@ -87,7 +88,7 @@ void MineFacility::think()
  if (mMine->active())
  {
  - if (storage() >= capacity)
  + if (storage() >= MaxCapacity)
  {
  idle(IdleReason::InternalStorageFull);
  return;
  