1-bit Pack Supplemental Autotiles

Based on 1-Bit Pack by Kenney, these tilesheets support auto-tiling better than the original pack.

A few creative liberties were taken, but minimally.

Here's how the setup for auto-tiling looks like in Godot:

Thanks to Kenney for providing the original pack under the CC0 license. This pack is also licensed under CC0.

Feel free to make any suggestions.