Improve WordTextBox functionality

[PrzemyslawKlys]

This PR adds the following features:

• Use Paragraph instead of StdBlock (so that text within a TextBox is no "variable" anymore)
• Allow changing the insets of the TextBox so that there is no gap between the text of the TextBox and its border
• Allow the TextBox to be set to "AutoFitText" or not
• Allow the text to be multiline by respecting the page breaks
• Added Wrapping functionality including inline
• Added ability to convert inline to other wrapping types and vice versa (keep in mind that some properties are lost then or go to their defaults)
• Fixes wrong paragraph being returned when AddImage is used

Breaking change:

• Changes WrapTextImage.InFrontText to WrapTextImage.InFrontOfText to match Word naming