updated all icons to svg. tweaked welcome page for better spacing
fading welcome page out now when container is requested the first time
updated test code for Dialogs
prevented page fader from taking mouse events after first container opens. added comment for pyside bug in case we run into it at some stage
re-designed save stack button to allow for three options (saving stack as  new list, overwriting existing list and saving to text file). I still need to prevent downloads from being offered as a list to overwrite and implement saving to a file
adding missing icon for removing buttons from drop stack
removed downloads favorite from menus that enable saving lists as its automatically generated and should not be edited manually