Log Message:
wxsvg: update to 1.5.20.

Version 1.5.20 <2019-08-02>
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  * added handling of fill-rule
  * added handling of spreadMethod
  * added handling of clipPath
  * added support of dash-offset
  * added support of mask for path element
  * fixed handling of pt units
  * fixed fill pattern with opacity
  * fixed handling of referenced patterns

Version 1.5.19 <2019-06-24>
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  * fixed rendering polyline element
  * fixed drawing a cubic Bézier curve if the previous command was not an c or s

Version 1.5.18 <2019-05-19>
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  * wxFfmpegMediaDecoder: fixed support of ffmpeg 3.4.x

Version 1.5.17 <2019-05-19>
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  * wxSVGUseElement: fixed GetBBox() and GetResultBBox()

Version 1.5.16 <2019-01-27>
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  * wxFfmpegMediaDecoder.SetPosition(): added parameter seekBackward

Version 1.5.15 <2018-09-15>
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  * added skia backend (experimental) (thanks to Zicheng Yang)

Version 1.5.14 <2018-07-10>
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  * fixed calculation of bounding box if viewbox is specified
  * fixed GetResultBBox()
  * wxSVGCanvasImage: added support of data base64 href

Version 1.5.13 <2018-01-29>
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  * added support of <a> element
  * fixed wxSVGImageElement::GetBBox()
  * fixed wxSVGUseElement::GetBBox()

Version 1.5.12 <2017-05-01>
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  * wxSVGSVGElement: fixed GetIntersectionList()
  * wxSVGPointList: fixed SetValueAsString()

Version 1.5.11 <2016-12-28>
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  * wxSVGImage: fixed displaying of first video frame

Version 1.5.10 <2016-10-23>
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  * added support of EXIF metadata

Version 1.5.9 <2016-08-09>
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  * changed GetBBox() and GetResultBBox()
  * added some missing header files

Version 1.5.8 <2016-06-05>
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  * fixed ApplyAnimation

Version 1.5.7 <2016-05-03>
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  * wxFfmpegMediaDecoder: added GetChapters() and GetMetadata()
  * fixed SVGAnimationElement

Version 1.5.6 <2016-03-11>
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  * fixed SVGAnimationElement

Version 1.5.5 <2015-10-03>
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  * fixed rendering image element with mask
  * wxFfmpegMediaDecoder: added GetFormatName() and GetCodecTag()
  * wxFfmpegMediaDecoder: fixed wxSVGCanvasVideo

Version 1.5.4 <2015-03-21>
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  * added support of 3-digit hex color codes (thanks to Constantine)