Started to add elemental status effect support.

Elemental status effects are now supported and shown in battles,
but not yet applied on the character's elemental atk/def.

And that's because elemental atk/def of character is to be implemented
first. ;)
Did a small TODO
Adding VC2012 project and solution files.
Adding a submodule for the VS2012 dependencies.
Fixing all level 4 warnings and higher.