Ben/events

- Enable / Disable actions show the current state
- Reload only when it is necessary and applied changes have impact.
- Blur the extension only when it is installed and not activated
- Improve messages for reload
- Remove status widget

Added gitter chat badge to readme

fixes #14352

fixes #14357

fixes #1104

Fix #14135 - Allow files with merge status to be staged

Allows files with merge status to be staged using workbench.action.git.stage.

fixes #14674