Core/PreparedStatements: Fixed a Coverity warning
Core/DatabaseWorkerPool: Delete PCQ in dtor rather than in Close() and cancel queue properly before doing so
Misc/Travis: Tune down the amount of parallel builds and disable PCH
Scripts/ICC: Fix non-pch build
Core/Misc: Remove a define that is no longer needed since ACE was removed
README: Display 4.3.4 Travis badge instead of master's
Revert "README: Display 4.3.4 Travis badge instead of master's"

This reverts commit 5ca5d9fe44d23869034c559810f7e0797fec0499.

Wrong branch, I'm sorry.
Increased default thread pool size as it now handles more than signals and remote access
DB/Quests: Add conditions to quest The Symbol of Live

Closes #11444
Core/Authserver: Fixed changing realms