Core/Transports: Delayed adding transport model to next tick after teleporting to fix race conditions happening when teleporting transport happens at the same time as destination map balances its dynamic LoS tree
Core/DBLayer: Fixed an incredibly rare memory leak happening when player started loading from database and never finished
Core/Battleground: fixed possible mount abuse after leaving BG
Merge pull request #12847 from ShinDarth/tc_fix_mount_abuse_after_bg

Core/Battleground: fixed possible mount abuse after leaving BG
DB/Misc: Misc Fixes

On agro texts and a missing gossip option and menu.
Merge remote-tracking branch 'upstream/master'