Use multiline quotes in Powershell to simplify generated code

[webholik]

Before:

$body = "{`n        `"hello`": `"Wirld`",`n        `"this`": [`n            `"that`",`n            `"`$when`",`n            `"as`"`n        ]`n    }"

After:

$body = @"
{
        `"hello`": `"Wirld`",
        `"this`": [
            `"that`",
            `"`$when`",
            `"as`"
        ]
    }
"@