SVG serialization big changes

[katehryhorenko]

BACKGROUND:

• We needed ability to create PDF drawing. But we were using Svg.net library that didn't support it.

DESCRIPTION:

• All common SVG classes don't have any dependences from a third libraries
• A new SkDrawingTool that is using Skia library to create svg and pdf drawings
• Removed all referenced to Svg.net from SvgSection class. The only reference that is left is used inside deprecated method
• I left SvgSectionOld class with old SvgSection logic to support prev. implementation that now is marked as deprecated
• All properties inside SvgContext class are third party free. Old properties are marked as deprecated

TESTING:

• I tested this changes inside PanelMaxExporter function and inside StockingPlanExporter

FUTURE WORK:

• Add comments
• Add SvgNetDrawingTool implementation. We already know how to use Svg.Net. It makes sense to add SvgNetDrawingTool implementation
• Move more common logic to SvgBaseDrawing and to BasaDrawingTool
• SvgFaceElevation must inherit SvgBaseDrawing

REQUIRED:

• All changes are up to date in CHANGELOG.md.

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