Symbol Puzzle

Before:

After:

This is a version of this year's AQA Computer Science A-Level Pre-release code, Symbol Puzzle, with a GUI built in Windows Forms. It has some minimal changes to the skeleton code classes to make it work smoothly with the forms environment.

Class Changes

Puzzle: Commented out unused console-related methods and made properties public.
Pattern: No changes.
Cell: No changes.
BlockedCell: No changes.