Added VS2013 solution and project files (by JMich)
- You can also open them with VS 2012
- I just changed the toolset for all projects to V100 (VS 2010) instead of V120 (VS 2013), because I don't have VS 2013 installed. If anyone can't compile with VS 2013, we simply switch back to V120 toolset

git-svn-id: https://ja2svn.dyndns.org/source/ja2/trunk/GameSource/ja2_v1.13@6639 3b4a5df2-a311-0410-b5c6-a8a6f20db521