Better handle changing window group.

Small fixes.

Update README.

Add support for ordering window groups.

Add setting for moving new windows to the top.

1.2.0.4

1.2.0

Refactored the start and stop sequences.
Popup can now detect start/stop events and show the running state to the user.
Implemented detection of the Native App failure.
Added common/const.ts module.
Bumped target JS version to ES2018.

1.1.1 Formatting (mostly spaces -> tabs indent fix)

1.1.0 First Public Release

Renamed arranger module to messenger.
Fixed many Typescript hacks.
Implemented getArrangement function.
Migrated to native JS modules from the previous closure solution.
Organized the files into folders.
Improved error handling.
Extracted Array extensions to a new file.
Added a settings page (now can show/hide go-to-console in popup).
Added localization for settings and extension name and description.
Changed console log levels.
Added types for windowsExtended experiment.
Replaced beta icons with new ones.
Changed ID of the extension.
Bumped target JS version to ES2017.
Added run-reloading to Makefile.
Deleted TODO file.
Added LICENSE and README.