Rename "globals" to "variables" when the variables are not grouped

[civan]

We support Grouped section using annotations when the variables not grouped within any group they're added to globals property (example).

we want to group them in variables key:

{
    "variables": [
        { "variable": "$black", "value": "#000", "compiledValue": "#000" },
        { "variable": "$slate", "value": "#8ca5af", "compiledValue": "#8ca5af" },
        { "variable": "$global-group", "value": "#ff0000", "compiledValue": "#ff0000" }
    ],
    "brand-colors": [
        { "variable": "$brand-gray-light", "value": "#eceff1", "compiledValue":"#eceff1" },
        { "variable": "$brand-gray-medium", "value": "#d6d6d6" ,"compiledValue":"#d6d6d6" },
        { "variable": "$brand-gray", "value": "#b0bec5", "compiledValue": "#b0bec5" }
    ],
    "fonts": [
        { "variable": "$font-size", "value": "16px", "compiledValue": "16px" },
        { "variable": "$font-color", "value": "$brand-gray-medium", "compiledValue":"#d6d6d6" }
    ]
}

Don't forget to update:

• source code Source Code: Renamed globals key to variables #38
• unit tests Source Code: Renamed globals key to variables #38 Test Cases: Renaming globals to variables #40
• documentation Documentation: Renamed globals to variables #39
• examples Updated Examples: (key)globals to variables #37