WidgetLabel::setText() and correct rich-text format

[eugene.litvinov]

We use html-formatted strings for rich-text format, we have two examples:

1.

"<font face=source/gui/calibriib.ttf color=#DDDD00 size=20>" +
"Scarlet darkness in the heavenly mobile" +
"</font>"

2.

"<font face=source/gui/calibriib.ttf color=#DDDD00 size=20>" +
"Scarlet darkness in the heavenly mobile" +
"</font>"

Both this variants present on screenshot:

 

Right behavior: second point must working like first

Details: Convert Xml node's children to string

[frustum]

The rich text parser is fixed.