Few extension improvments and fix

[cedelavergne-ledger]

This PR contains:

• Fix package versions and dependencies
  • webpack
  • electron
• Start "Update Container" task in background
• Improve KeepTerminal to also include "Load app on device" and "Delete app from device"
• 1st CI workflows to perform:
  • Spelling check and
  • Build / Lint / Test (#10) on Windows, Mac, and Ubuntu
  • Deploy the extension when a new tag is pushed
• Export the chosen device when opening the terminal (#15)
• Add function to properly retrieve the APPNAME, using make listinfo (#40)
• Add build use case feature, allowing to build with a use case defined in the manifest (#14)
• Add build variant feature, allowing to build a specific variant (#14)
• Save the selected target device in settings (#39)
• Update documentation & version

[agrojean-ledger]

A few remarks regarding the Select build use case user interface, in my opinion :

1. By moving the selection icon (small "gear") to the build section line, we can remove the line Select build use case which becomes redundant.
2. The line build with debug mode is redundant with the Debug build use case selection from the new UI element.
3. We need two default use cases for C apps :
   • Default (release mode compilation, we can actually call it release)
   • Debug (with DEBUG=1). If there is a Debug use case in the ledger_app.toml, it should be displayed instead of the default one.