Rework label to not hinder clicking the icons

Signed-off-by: Marko Locher <marko@locher.at>
Redesigned SelectionManager

Signed-off-by: Marko Locher <marko@locher.at>
Moved 'old' styles to the bottom of the file

Signed-off-by: Marko Locher <marko@locher.at>
Redesigned Download window

Signed-off-by: Marko Locher <marko@locher.at>
Redesigned About dialogue, added markup and styling for modals

Signed-off-by: Marko Locher <marko@locher.at>