"Soap-free Cleanser" - dolmades v1.2

• Wine 4.0.2 / 4.20 with Mesa 18 and 19
• Refactored docker base images: winehq-stable-xenial, winehq-stable-bionic, winehq-staging-bionic
• Code cleanup / bug fixing / beautification
• New dolmades help subcommand
• Fix broken menu entry deinstallation
• Make dolmades export reproducible
• Boxed dolmas do not require pycurl, just curl+python 2.7 for installation