Single Player To Do List

[lknutilla]

Board:
-Board Creation based on Level (Mikey)
-Clicked Numbers highlight other numbers (selecting one 9, highlights all 9s)
-Shortcuts for entry (see http://www.komoroske.com/sudoku/)
-Improved board creation AI(Mikey)
-Number Entry (LK)
-Note Entry (LK)
-Selection of Number Highlighting (LK)
-Number entry validation (LK)
-Pause Game Functionality (Don't allow number entry while game is paused) (LK)
-Only allow number(1-9) entry (LK)
-When numbers are deleted, subtract board_size (more generally handle board_size) (LK)

Side Bar
-Undo/Redo (Lauren)
-Number Pad (LK)
-Timer (LK)
-Entry/Note Toggle (LK)
-Pause/Play (LK)
-Level Functionality (Disable/Handle during game play)
-Quit Game (LK)