Added wave audio codec, fixed oggplugin

proj/SkyXEngine/vs2013/SkyXEngine.sln

proj/oggplugin/vs2013/oggplugin.vcxproj

proj/wavplugin/vs2013/wavplugin.vcxproj

proj/wavplugin/vs2013/wavplugin.vcxproj.filters

source/oggplugin/AudioCodecOgg.h

source/oggplugin/plugin_main.cpp

source/wavplugin/AudioCodecWave.cpp

source/wavplugin/AudioCodecWave.h

source/wavplugin/dllmain.cpp

source/wavplugin/plugin_main.cpp