Generate docs from options PART 1

[tusmester]

Generate docs from option classes so that we do not have to write configuration documentation manually.

• create a way to mark option classes to process (a new attribute?)
  • option section path (sensenet:logging)
  • default values
  • full section example (try to generate it automatically)
• document at least 2 classes in source code as a PoC
• create a tool that generates readable markup similar to odata action docs

OUT OF SCOPE: documenting all option classes is a different issue