Method increment_usage

src/common/classes/alloc.h:121–129

These methods are thread-safe due to usage of atomic counters only

	// These methods are thread-safe due to usage of atomic counters only
	void increment_usage(size_t size) noexcept
	{
		for (MemoryStats* statistics = this; statistics; statistics = statistics->mst_parent)
		{
			const size_t temp = statistics->mst_usage.exchangeAdd(size) + size;
			if (temp > statistics->mst_max_usage)
				statistics->mst_max_usage = temp;
		}
	}

	void decrement_usage(size_t size) noexcept
	{