Added limits for size, an error message popup and a cursor

[aaravtanti]

Changes

• Added a cursor to the size box
• Added a limit for the range on 1-1000 for the size box
• Added an error message if user input exceeds 1000
• Added functionality that does not allow the user to have less than 1 digit in the text box

Why (resolves #184)

• Addressed the concern of the difficulty in typing a new size for the bars by implementing cursor functionality
• Added functionality that does not allow the user to have less than 1 digit so that the program does not crash (as there will never be no input in the size box)

How

• Added an error message using the pygame display function; set a timer for the error message to ensure that the viewer can quickly change their input
• Added cursor definitions in the class and updated the draw function

Testing
nil

Screenshots

Clipped.for.PR.mov