Define some opcodes
Merge pull request #13744 from Golrag/Opcodes

Core/Opcodes: Add some opcodes
Core/DataStores: Added DB2Manager

* Moved DB2 helpers to new class
* Moved hotfix data to hotfixes database and core management functions to DB2Manager class
* Updated HotfixNotifyBlob packet
DB/Quests: Moved quest visual effects to their own table
Scripts/Naxxramas: Add script support for quarter teleporters and spawn missing ones

Updates #13255

(cherry picked from commit aff5229cd1777581bd85079d064037a57bf17799)
DB/Quests: Splitted quest_template into different tables
SQLs: Replace placehold variable by default world db name

Travis tests SQL imports and it would fail otherwise.

Do not forget to change the variable to your world database name (if different from 'world') in the file 2014_12_25_00_hotfixes_locale_broadcast_text.sql
Scripts/Oculus: Implement a couple of missing texts

(cherry picked from commit 63c1e265aace363a1d889b1621c0cc3a9263e956)
Scripts/Commands: Fix a conversion loss at the mute history command

(cherry picked from commit 5d4f26d82028823f4672e370deaf0f6069fb225f)
DB/Quests: Moved non-WDB data from quests to its own table
DB/Quests: Accommodated quest_greeting table for gameobject entities
Core/Scripts: Add Conjure Refreshment Table script

    - Fix Conjure Refreshment for characters above level 85