UPDATE: webp lossless options updated
FIX #31 : Refresh output size on file load
FIX #19 : Add Label fro sizes selected

This is a temporary set as I'm planning to move the Size Gui from
the dynamic buttons to a button + listbox. This has the advantage to
add sets of sizes from a file, from presets and from the GUI and also
delete more than one at a time
FIX #15 : Horizontal GUI: Version bump to 2.0.0