`RegExp3` to convert some expressions of Jekyll kramdown to markdown.

Derived from
mohzy83/NppMarkdownPanel
v.0.7.2

merged mohzy83/NppMarkdownPanel v.0.6.2

.

merged mohzy83/NppMarkdownPanel v.0.6.1

Some tests added.

Do not escape chars in file: url (IE/Edge bug)

Do not escape chars in file: url (IE/Edge bug)
if
BaseUrl.Scheme == "file" && UseNonAsciiNoEscape
i.e. fix a bug under IE/Edge with local file links containing non US-ASCII chars

Also when [alt] starts with "url_" then unescape input url. See "test01" in "*.zip".

Version 0.5.1.2 auto-name for save-as HTM

save-as_0.5.1.2

Do not auto-save when file name text is empty

`</html>` at the end

MarkdownPreviewForm.cs: </html> at the end, no </meta>

cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.6 not working in N++ MdPanel. Changed to 2.7.5 (see NppMarkdownPanel/Resources/_posts/)

RegExp3txt

Replace N++ text with multiply RegExp before Makrdown conversion.
Rarely read "RegExp3.txt" and "style.css."