0GUI resurrection (Patreon)

This weekend I've remade the old 0GUI with renpy 8.1.3.
0GUI is renpy's screens with all of the new GUI connections stripped from them. This way, you can change the default look by simply choosing few colors, or changing few lines in one file in case you want to use images in the design.
It's also a good starting point for those who want to overhaul the whole interface, by editing the screens directly, and don't want to deal with the default GUI.
The advantage of the new 0GUI over the old one is: It no longer modifies the default style that caused some problem with `show image` in the old one. And I've thoroughly tested all screens this time (including the new chat bubbles) and made sure they function correctly out of the box, with some demo in case you want to try them yourself but don't know where to start.
In the near future, I'll make a couple of more sophisticated whole GUI designs, that you can plug into your game. If you want to influence my design to fit better in your project, leave a comment and I'll try to design one of them close to what you want.