Change m_clientGUIDs from std::set to std::unordered_set to reduce by 2.7x times the cpu usage in Player::HaveAtClient() (cherry picked from commit 49ececf03830ca1d3df45bec1cd7f657d309450b)
Change m_clientGUIDs from std::set to std::unordered_set to reduce by 2.7x times the cpu usage in Player::HaveAtClient() (cherry picked from commit 49ececf03830ca1d3df45bec1cd7f657d309450b)