issue-#113 bugs in Xhtml subsystem

[Ivan Denisov]

This is voting about issue-#113.
http://redmine.blackboxframework.org/issues/113
The discussion

When we started to use Xhtml for making changes list it had been found that it's design has several bugs.
During the discussion of the solution we made many fixes for output fit the XHTML standard.

The summary of all the changes:
Ascii and Unicode characters are converted to utf-8 anyway and no characters can get lost now.
Meta tag added for setting the encoding to utf-8 within the generated html document.
Fixed closing (right-hand) view of a StdLinks.Target which was ignored and lead to an incorrect nesting of elements.
Changes to make the output conform to the XHTML standard.
Conversion of StdLinks.Link with command Dialog.OpenExternal added.
Default font size and typeface now are handling. Newlines converted into <br/>.
Support for additional character and paragraph attributes: strikeout, lead, width, margins etc.
Support for links embedded within text added.
Page title set to window title, if available, otherwise 'New Page'.

The BlackBox version for testing:
http://blackboxframework.org/unstable/i ... b1.548.zip

The suggested differences:
http://redmine.blackboxframework.org/pr ... 5e81617d02

[Ivan Denisov]

The voting is finished. Branch `issue-#113` had been merged with `master`.

The resulting version is:
http://blackboxframework.org/unstable/m ... b1.549.zip