Treat SVG files as XML to allow minification

[strongville]

🚀 Enhancement Request

Is your enhancement request related to a problem? Please describe.

• When selecting "Minify the selected document and preserve the original" on an SVG file, the plugin indicates this error: "⛔ We can not format this file type yet (svg), use a valid one".
• As SVG file format is internally an XML, this should be supported out-of-the-box.

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Describe the solution you'd like

• When selecting "Minify the selected document and preserve the original" on an SVG file, create a -min file with extension SVG.

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Describe alternatives you've considered

• Renaming the SVG files to include extension XML instead makes the minifier work.
• However, the extension assigned to the -min file is HTML, something that probably happens with all XML files.

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