I have added a foot.ini which preserves the color scheme that had been set up on xfce4-terminal (with the purple background and transparency), except using the Material color scheme for terminal fonts. The bright colors of the fonts look good on the purple, and are easier to read than the old font colors.
Other changes in this PR:
* Add foot to package lists; remove xfce4-terminal
* Autostart foot-server in Sway config
* Change default terminal in Sway config
* Change Waybar on-click actions to use footclient instead of xfce4-terminal
* Update cheatsheet, keyhint files
* Update Wofi, Thunar configs to use footclient instead of xfce4-terminal
* Remove `format-charging` and `format-plugged` settings in favor of just using the graduated battery level icons. Also is a depreciated/removed Nerd Font icon. If we want to visually differentiate the charging state, CSS rules in `~/.config/waybar/style.css` might be a better way to handle that.
* Remove the commented lines because it is unlikely we will ever want these specific settings.
* Remove PBPbattery module and associated script. It is all commented out anyway. This feature has been built-in to Waybar for some time now; a custom script is no longer needed.
