Add Vue devtools to the debug mode

[McGiverGim]

Adds the Vue devtools to the yarn start command. It does not add it to other "similar" commands like gulp debug, maybe we can look to do the environment injection in the gulp file and not in the package to achieve the same.

This PR uses cross-env to fix the problem of environment variable in windows, but maybe is better to use this other solution: #2226 based on script-os. So first we need to decide which of them we take before merging this.

[mikeller]

To be fair I prefer script-os, as it works at a lower level (i.e. it can be used to make things in yarn targets other than environment variables platform dependent.

[mikeller]

I think making this work for the yarn... invocation is entirely sufficient - this is the correct way to invoke gulp, as calling gulp... directly will call the gulp binary in the path, which may or may not end up using the version of gulp that is specified in package.json.

[McGiverGim]

To be fair I prefer script-os, as it works at a lower level (i.e. it can be used to make things in yarn targets other than environment variables platform dependent.

Perfect, I will rebase this after the other PR is merged.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
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0.8% Duplication

[McGiverGim]

Rebased and ready to be merged!!!