Edit variables from the watch panel

[noetzold]

VS Code (now) supports editing variables from the watch panel: https://github.com/microsoft/vscode/issues/130170 From my understanding it should be fairly easy to implement: https://github.com/microsoft/vscode-mock-debug/commit/62f636d39fd17a68c5d90ee09d0c164ac66376bc

There is a closed issue for this topic, as VSCode did not support this feature at the time: https://github.com/Marus/cortex-debug/issues/345