Story 2.6: Supplying Information to Code Blocks

[nailahi]

(1) Description: As a student user, I want to be able to fill in certain portions of code blocks with my own input, so that I can alter their behavior as needed to solve a problem.
(2) Acceptance criteria:
(a) Spaces within the code in the blocks will clearly show what the user will be supplying.
(b) These spaces will be editable by the user after the code block is placed into the workspace section.
(c) The spaces will be edited via textbox or dropdown menu, whichever is deemed more appropriate for the block in question.