Add the ability for the user to simply run the executable

[martytyty2098]

Running the program from a terminal seems a bit counter-intuitive to most users, so I added the ability for the user to use the program by double-clicking it and then passing in the video path and frame width, as well as handling some exceptions:

• If the program cannot find the chars.txt it will fall back to its built-in character list
• Placed std::cin.get() before each exit point of the program so that the terminal window does not close immediately
• If the video frames are too small, the user will be informed about this

[sarahayu]

Looks good. I'll merge once I make a new executable so as to not cause any confusion.