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element drawers should not be stored statically #336

Description

@ivanjx

each ElementDrawers have its own SKCanvas and on servers it can cause SkiaSharp to crash. some objects may also not be rendered correctly or skipped being rendered entirely with the current approach.

Fatal error.
0xC0000005
at SkiaSharp.SkiaApi.sk_canvas_draw_text_blob(IntPtr, IntPtr, Single, Single, IntPtr)
at SkiaSharp.SKCanvas.DrawText(SkiaSharp.SKTextBlob, Single, Single, SkiaSharp.SKPaint)
at SkiaSharp.HarfBuzz.CanvasExtensions.DrawShapedText(SkiaSharp.SKCanvas, SkiaSharp.HarfBuzz.SKShaper, System.String, Single, Single, SkiaSharp.SKTextAlign, SkiaSharp.SKFont, SkiaSharp.SKPaint)
at SkiaSharp.HarfBuzz.CanvasExtensions.DrawShapedText(SkiaSharp.SKCanvas, System.String, Single, Single, SkiaSharp.SKTextAlign, SkiaSharp.SKFont, SkiaSharp.SKPaint)
at SkiaSharp.HarfBuzz.CanvasExtensions.DrawShapedText(SkiaSharp.SKCanvas, System.String, Single, Single, SkiaSharp.SKFont, SkiaSharp.SKPaint)
at BinaryKits.Zpl.Viewer.ElementDrawers.BarcodeDrawerBase.DrawInterpretationLine(System.String, SkiaSharp.SKFont, Single, Single, Int32, Int32, Boolean, BinaryKits.Zpl.Label.FieldOrientation, Boolean, BinaryKits.Zpl.Viewer.ElementDrawers.DrawerOptions)
...

a fix like this eliminates the error and the buggy behavior: ivanjx@56ed1f9

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