* fix: load system fonts to usvg font_db, this will make rendering of text in svg that has it
* feat: add an example that renders svg that has text on it
* Initialize `fontdb` only once for `vector` images
* Remove `svg_text` example
* Set `fontdb` for `usvg::Options` in `tiny_skia::vector`
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Co-authored-by: Héctor Ramón Jiménez <hector@hecrj.dev>