Added CorePrinting example window

- Changed CorePrinting.SetDefaultPrinter and DefaultPrinter to reflect
new classes.
- Added static CorePrinting.PrintSession.
Added AuthorizationShell with example

- Combination of code from KT and TT.
- Example window is basically TT’s.
Added pragmas for unused method params and variables
Prepare for release

- Added release notes.
- Incremented version to 168.
- Tested compile on all platforms.