Core/Quests: Added SMSG_QUESTGIVER_REQUEST_ITEMS
Core/Quests: Added CMSG_QUESTGIVER_REQUEST_REWARD
CMake: Require VS 2013 Update 3

Update 4 (includes 3) can be downloaded at http://www.microsoft.com/en-us/download/details.aspx?id=44921

Closes #13813
Merge pull request #23 from TrinityCore/6.x

Merge