KWin dynamic resizing and the first layout

After a short break due to various other responsibilities and a general lack of clarity in planning some of the code, I've made progress and now you can resize windows while in tiling mode and watch all the others adjust themselves to fit the screen. Admittedly there are a few kinks, and an annoying bug where the resize pointer suddenly makes the window super-tiny, but they should be fixed in two or three days. I also implemented a basic Spiral layout today which keeps halving windows and moves towards the centre in a spiral. Gradually layouts will be in the form of a plugin system, and you would be able to choose different layouts for each virtual desktop. Here is the latest screenshot. House of Cards it is.