Allow reply to whispers if you are under CONFIG_CHAT_WHISPER_LEVEL_REQ, and implement feature for GMs to remove single players from their WhisperWhiteList.
Remove documentation for script/custom texts

The related code and tables do not exist anymore.
Fix some engrish
Core/Unit: Fall after exiting vehicle if is in air and can not fly
Script/Quest: Into the wild green Yonder

Still todo:
* Fix spell focus requirement for the drop spell casted by the vehicle

Closes: #8752
Merge pull request #9396 from thomas007788/Whispers

Allow reply to whispers if you are under CONFIG_CHAT_WHISPER_LEVEL_REQ
SQL: Rename SQL file after PR merge
Core: Fix non pch build
Scripts/Commands: Fix "cannot pass objects of non-trivially-copyable type ‘std::string’ through ‘...’"
Merge remote-tracking branch 'upstream/master'