Several fixes to the slider
Made layout handling a bit smarter. Components with unknown size get automatically expanded into available space.
Fixed a bug in the slider where it would incorrectly calculate the dx/dy when clicking on a slider that was already further.
Made the block list refresh much more nicer.
Removed unneeded test code
Added a new BlockRender widget and some other minor fixes.
Layout fixes and bigger window. Also created a new RenderHelper class which holds common gui functionality.
Better readable text