[cmdr][applet] create "applet"s & cmdr "shell"

[nazmulidris]

Motivation

I use nordvpn all the time. It would be great to have a TUI app to control it and see the status of it. It would also be great if this was in the r3bl-cmdr "shell" which can be used to launch multiple TUI applets.

I also use sqllite3 databases everywhere, even vscode has them here /home/nazmul/.config/Code/User/workspaceStorage, where it stores the editor layout for each locally opened folder.

What to build

It would be great to have TUI applets for:

1. sqllite3 browsing, so that I can easily open a db file and browse its tables in a nice TUI, eg dbviewer <myfile>
2. nordvpn status, control, and config, so that I can easily see what the current status and settings are. And change the settings and settings as I need to (eg: local network whitelist, and machine names for meshnet).
3. docker container status and control. what containers are running, information about their persistence, and option to delete them.
4. An applet named ditto, which allows common files to be synced between machines. ditto will need to be configured with a ditto.json file, that can be edited using edi. I want all the r3bl applets to be used in this shell.

Launcher binary

The rc bin target is a new program that is a shell which accepts commands that run applets.

It might also be a good idea to provide binaries to launch each applet on its own. Or just allow the applet name to be passed in as an argument to the rc binary.