Input/Output inspector in messages area

[jeissonh]

Let user inspect input and output received and produced by his/her solution in the current active test case.

• [x] Add a new tab in MessagesArea for the inspector
• [x] Slice the inspector in three areas: Input, controls, and output
• [ ] Edit: Slice the inspector in four areas (args was missing)
• [x] Input shows the bn_nn_input.txt file
• [ ] Initially all input is in black, consumed input in light grey
• [x] Controls is a vertical button bar
• [x] Controls has a button to switch between standard output and standard error
• [x] Standard output/error initially shows the test case expected file
• [ ] Expected output/error text is in light gray
• [ ] Player solution generated output/error text is in black if it matches, red from the character it differs

In the future user may type input/output/error directly on this inspector.