Added calendar visualization to verify the output of the unit tests.

- the second parameter of sqlprune.exe is the path, no need to use -path prefix.
- Created a prune service responsible for determining if a backup within a set can be pruned or not.
- Added references to newtonsoft.json.
Added date time extension method to get the start of the week of any given date.
Command now flags if a backup should be pruned or kept.

- Created a little helper to output coloured text tot the console
- Improved path error handling.
Added disclaimer.
The tool now delete files!

- Improved getting files in specified folder (skips recycle bin and folders it cannot access).
- Added -no-confirm flag to run the command without user interaction.