Core/Misc: Code cleanup

Remove old unused opcode handler WorldSession::HandlePageQuerySkippedOpcode() for CMSG_PAGE_TEXT_QUERY since it's already handled by WorldSession::HandlePageTextQueryOpcode()
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore into ghbb
Core/Misc: Added utility method for checking is two sorted containers have a common element
Scripts: Remove unused variables (kept as comment)
Script/Shadowmoon Valley: Remove hack in npc_shadowmoon_tuber_node.

This script will be converted to SAI (if possible) later.
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore into ghbb
Core/Misc: Kick player in case of multiple CMSG_PLAYER_LOGIN

Kick player in addition to logging an error in case of multiple CMSG_PLAYER_LOGIN.
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore into ghbb
更新