ClrDocToMediaWiki

- ADD: first pre-alpha
- ADD: namespace filter
- ADD: saving task settings to IDocumentationSettings objects
- CHG: speed improvements
- CHG: code cleanups
- FIX: NullReferenceException
- FIX: genering parameter lists
- FIX: other minor fixes
ClrDocToMediaWiki

- CHG: continued implementation of generating output MediaWiki data
added MarkdownSharp and made minor fixes and cleanups
minor fixes
removed MetalVZ project
extension methods

- ADD: PushRange() and PeekOrDefault() extension methods for Stack<T>
class
- ADD: AddExportedValueProvider() extension methods for
CompositionContainer classes
- FIX: documentation fixes