[core] Rework core implementation

Experimental re-implementation of core functionality with the aim:
- Depend only on the Python Standard Library for core
- If modules are missing elsewhere, *never* throw
- Unit test *everything*
- Cleaner and more minimal implementation
- Better integration points for existing implementations (charts,
  braille, etc.)
- Full backwards-compatibility with existing module system (except where
  modules can be vastly simplified)

bin/load-i3-bars.sh

@@ -1,30 +0,0 @@
-#!/usr/bin/env bash
-
-if [ ! -f ~/.config/i3/config.template ]; then
-	cp ~/.config/i3/config ~/.config/i3/config.template
-else
-	cp ~/.config/i3/config.template ~/.config/i3/config
-fi
-
-if [ -f ~/.config/i3/config.template.private ]; then
-	cat ~/.config/i3/config.template.private >> ~/.config/i3/config
-fi
-
-screens=$(xrandr -q|grep ' connected'| grep -P '\d+x\d+' |cut -d' ' -f1)
-
-echo "screens: $screens"
-
-while read -r line; do
-	screen=$(echo $line | cut -d' ' -f1)
-	others=$(echo $screens|tr ' ' '\n'|grep -v $screen|tr '\n' '-'|sed 's/.$//')
-
-	if [ -f ~/.config/i3/config.$screen-$others ]; then
-		cat ~/.config/i3/config.$screen-$others >> ~/.config/i3/config
-	else
-		if [ -f ~/.config/i3/config.$screen ]; then
-			cat ~/.config/i3/config.$screen >> ~/.config/i3/config
-		fi
-	fi
-done <<< "$screens"
-
-i3-msg restart