See ExCSS pull request #62: https://github.com/TylerBrinks/ExCSS/pull/62

- found by @Seairth
- fixes #108

- ignore elements with recursive references
- fixes stack overflow for test image struct-use-12-f.svg

- originally provided by @ssteiger in #316

- fixes TestPrivateFront unit test (threw exception because the image
  had zero size, as the only element is a "use" element)

- vertical graphics context resolution has been used incosistently which leads to wrongly positioned texts when printing

- ignore textLength attribute if X attribute is list
- add test images

- suppress warning CS1591: Missing XML comment for publicly visible type or member
  to avoid to overflow the build log with warnings
- fixed the rest of the documentation warnings in SVG project
- ignore all failing tests for the time being

- Fix: adjustment is wrong in lengthAdjust='spacingAndGlyphs'.
- Add test images.

fixed SvgAttrribute reflection for .net core. (i guess Equals() function is called instead of Match() on this platform?)

In <image> element, preserveAspectRatio attribute default value is 'xMidYMid meet'.

https://www.w3.org/TR/SVG11/coords.html#PreserveAspectRatioAttribute

# image opacity fix

Fix fill usage by passing Color.Transparent color

- show description for W3C tests

- fixes text-text-12-t.svg

- use GetInheritedAttribute() to correctly handle "Inherit" value
- fixes inheritance of these attributes from groups
- fixes alignment in types-basic-01-f.svg test

- caused regression

- fixes __tiger.svg test image

- calculate svg element bounds considering child svg fragments
- consider svg fragment offset in bounds / dimensions
- do not create view box if none is defined
- fixes #244

- changes behavior to be as described in this file and in the W3C test
masking-path-03-b
- fixes that test
- this has been a regression after removing the unconditional clip box
for every view box, (see #279)

- fixed matrix order (Prepend instead of Append)
- fixes #64 (see __issue-064-01.svg and __issue-064-02.svg)
- fixes test for struct-use-03-t.svg

- relative URL have not been loaded (example: masking-path-06-b.svg in test data)
- Updated passing tests (note: not all changes are related to the current fix)

- a view box does not need a clip region, this breaks the overflow
handling
- overflow handling:  handle overflow attribut "Inherit" as Visible and
"Scroll" as Hidden as per W3C documentation
- fixes #279

see #281

1. Added XML Header, this is conform according to https://www.w3.org/TR/SVG/struct.html
2. Added support for removing Byte Order Mark (BOM), this needed in some cases, eg. if the SVG is used as SSI (Server Side Include) in IIS (Internet Information Server).

SvgTextBase Text property setter resets Node collection to have single content node with provided text.