Improve the UninstallWizard display system

Make the UninstallWizard window resizable to be able to display the leftovers founds fully. Implement a tree node system with checkboxes to easily select and unselect the items that should be removed. (The current method seems to me like a big cluster full of text. It looks messy for me and so difficult to take decisions about which files I should not let Your Uninstaller to delete)