Added Windows platform to Redkite

Worked some days and added also Windows platform to Redkite GUI toolkit. The main loop works, and it can process events. So, now I have a basic start of the GUI toolkit that works under GNU/Linux and Windows. Next to do is to develop a cross-platform painter class that probably will work with Cairo, but not sure for now, need to study.

What I am doing now is to develop the VST code to test that Redkite works under Windows for a GUI plugin. Having this, I’ll start to develop the GUI for Geonkick with Redkite toolkit, and at the same time developing classes for Redkite, first Layout and than Painter etc.