A new beginning

Added

• where it makes sense, defaults for command line settings can be changed in i3configger.json (command line overrides settings in config)
• make status command configurable (for refresh)
• off-switch for ipc configuration (for easier testing)
• functional tests for main cli functionality

Changed

• keep Python version in sync with Arch system Python: test with Python 3.7
• breaking changes in i3configger.json - check examples to see what is different. Easiest way to upgrade is to move your old config to the side, run i3configger to generate a new default config and add your settings from the old config back in.
• terminology: i3status -> i3bar
• terminology: value -> select
• internal modernization and refactoring

Fixed

• wrong use of reversed in select-next/previous

Removed

• option for different config has no real use and unnecessarily complicates things