- 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.

These shapes now render their fill, even if StrokeWidth less or equals zero.

RenderStroke method won't render the stroke if StrokeWidth is less or equal zero.

Added a test with a SvgText element where the whole text element was not written to XML of a deep copy of the SvgDocument.

If the root svg uses transformations ( e.g. defines a viewBox and
different width and height) the nested svg areas are misplaced or
invisible.

SvgPointCollection.ToString method modified to return valid coordinate string with each coordinate pair separated by whitespace and their x and y values separated by comma.

reference: https://developer.mozilla.org/en-US/docs/Web/SVG/Element/pattern

This is huge especially for the low values because human eyes distinguish darker colors much better.

- Changed SvgImage.Href property from Uri type to String to avoid UriFormatException if Uri contains too much data
- Changed GetImage to receive a string instead of Uri object.
  - Created a temp Uri object in method with substring of allowed length and using this to determine Uri characteristics

Documentation reference.

- change separator
- add documentation reference to separator changing
- remove and sort usings

As long as the functions AdjustForViewBoxWidth and
AdjustForViewBoxHeight are not fully developed pay attention that the
ViewBox width and height will not mismatch the positions of the marker
element then one of them are zero.

This changes are based on Issue #212 from mater.

Add: Quick solution to avoid  ViewBox width or height zero calculation.
Add: UnitTests

This reverts commit a7097113.