cleanups, fixes and compiler contants

- CHG: code cleanups
- FIX: added missing compiler constants for "Release" configuration
- FIX: typos
Cloud.NET, extension methods, fixes, improvements and cleanups

- CHG: continued coding Cloud.NET project
- ADD: SaveAs* extension methods for BitmapSource objects
- ADD: TakeScreenshot() extension method for FrameworkElements
- ADD: BeginInvoke() extension methods for DispatcherObjects
- FIX: documentation fixes
- CHG: code improvmenets
- CHG: minor cleanups