Official windows support

[wejick]

As far as I know QT is officially supported on windows platform, so IGNSDK should have official support for windows at least the desktop one.

[ubunteroz]

The current development version uses WebEngine as a replacement for WebKit. I tried to cross-compile IGNSDK using MinGW but failed. I haven't tried using VisualStudio, but as far as I know, Qt 5.5 for Windows doesn't support WebEngine yet because of it's complexity.

[wejick]

I just checked WebEngine page on QT docs, it seems only support Visual Studio for windows platform. I'll find time to check it.
The other important things I need to know is how much platform dependent code in use right now and what it takes to port it to windows.
Again I'll find time to check it by myself, but any information would be really appreciated.

[wejick]

I've been working on windows support for IGN-SDK recently. I couldn't guarantee it works on all test case -since my incapability to test-, but it should works on all test apps provided on trunk.
Please review #189 which would fix some compile error and make IGN-sdk runs on windows.

My environment is windows 8.1 64 bit with qt-opensource-windows-x86-msvc2013_64-5.5.0.