Install wis2box on host with pipx

[isedwards]

Background

I saw that cookiecutter recently switched to using pipx.

pipx installs and runs Python applications (CLIs) in isolated environments so that they are available as tools on the command line, but cannot be imported from system Python. This would also allow a few, small, additional dependencies to be installed that would not interfere in any way with the user's system.

Additionally, could the wis2box-create-config.py, wis2box-ctl and wis2box tools be combined into a single wis2box CLI tool that behaves appropriately depending on the context it is called from?

User story

• As the project maintainer, I don't want wis2box-ctl to install additional dependencies on the host machine that may cause conflicts with other software.
• As a user, I want wis2box-ctl to be available on the host machine without having to type python3 in front.
• As a developer, I want to be able to make use of a small number dependencies as part of wis2box-ctl to make it easier to develop and maintain the software

Acceptance criteria

• Users can install using pipx install wis2box instead of ...

  wget https://github.com/wmo-im/wis2box/releases/download/1.0b6/wis2box-setup-1.0b6.zip
  unzip wis2box-setup-1.0b6.zip
  cd wis2box-1.0b6
  

• Users can upgrade with pipx upgrade wis2box
• Users can cleanly uninstall with pipx uninstall wis2box

Definition of done

• unit/functional tests added/updated
• documentation updated
• live demonstration provided

[maaikelimper]

Assign to Tom for review. Not sure if this is in scope for the current sprint