Use newest mxpy (v9)

[andreibancioiu]

• Use newest mxpy (v9)
• Remove templates that aren't supported by sc-meta
• Run npm audit fix

From now on, vscode/settings.json should simply be:

// Linux:
{
    "terminal.integrated.env.linux": {
        "PATH": "${env:HOME}/multiversx-sdk:${env:HOME}/multiversx-sdk/vmtools:${env:PATH}",
    }
}

// MacOS:
{
    "terminal.integrated.env.osx": {
        "PATH": "${env:HOME}/multiversx-sdk:${env:HOME}/multiversx-sdk/vmtools:${env:PATH}",
    }
}