Add a text copy of the Ms-PL and update Markdown formatting

Fixed inheritance of  text-anchor and baseline-shift attributes

- 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

- ensures that #243 is fixed

Found better solution to SvgClosePathSegment tested with Tiger.

Reverted unneeded part of previous fix

- caused regression

Prevent crashes on zero length segments or paths

Correctly handle embedded SVG fragments without viewbox

- 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

Use Hidden as default SvgOverflow value

- 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 PushTransform for SvgUse

Do not create a clip region for view box

Allow relative paths for image URLs

- 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

Added array caching to AddToPath for a significant performance increase.

Fixed BoundsTest

- accidentally committed version with incorrect expected values

Add transform to bounds calculation in path based objects

see #281

link fix in readme

added chordious

add XML header and support for disabling the BOM in SvgDocument.cs

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).

Revert "Fix #176: Blurry text when overlapped with colored background"

Proper SvgTextBase.Text property setter behaviour