Project restructure, python implementation and bug fixes

[McCrafterIV]

I took the time to work a bit on this packaging. I implemented/changed the following things:

• most of the shell code was rewritten in python 3 to be easier to understand and hopefully robuster against changes (e.g. in versioning changes)
• added some logging to show the build/download process. This was necessary since the around 2GB download can take a lot of time on slower networks during which nothing other than a blinking cursor in the console indicated that the program works correctly .
• you can now select between the beta and stable versions using the --beta switch in the flatpack yaml configs. The latter is the default. Maybe this could be passed through to the command line so you can decide on-build if you want to use the beta version?
• fixed #6 -> added resolve logo to the project together with the license notice (CC-BY-SA) as required.

[pobthebuilder]

this looks awesome. i haven't well tested this myself yet; but i'm going to merge this up and i'll deal with any issues once i rebuild my resolve in a few days.