Additional commands could be previewable

This is a follow-up to #9794

Potential follow-ups

• changing the font size
• changing the font face
• changing the opacity of acrylic (#11205)
• Toggling acrylic? (#2531)
• SetPixelShaderPath?
• SetWindowTheme (light/dark/system/<some theme from #3327>)?
• sendInput, see 60f63b09c

Each of these could have default nested commands that have some example values. Like

{
    // Font size
    "name": { "key": "SetFontSizeCommandKey" },
    "commands": [
        { "command": { "action": "setFontSize", "size": 8 } },
        { "command": { "action": "setFontSize", "size": 10 } },
        { "command": { "action": "setFontSize", "size": 12 } },
        { "command": { "action": "setFontSize", "size": 16 } },
        { "command": { "action": "setFontSize", "size": 18 } },
        { "command": { "action": "setFontSize", "size": 24 } },
        { "command": { "action": "setFontSize", "size": 32 } },
        { "command": { "action": "setFontSize", "size": 48 } }
    ]
},