variable window size and dynamically set code width

[kdauer]

Problem to solve

As Squeak Enthusiast, I want the code in a window being readjusted dynamically, depending on the current width of the window so that it fits them optimally into view and avoid under-indented linebreaks.

Further details

relates to #26
Examples:

Acceptance Criteria

• When I resize my browser window, the line width is adjusting dynamically and the code is formatted nicely.

[Yannis-Hofmann]

Ideas:

• Resizing a window changes the max line length of the pretty printer and displays the code nicely.
• Would be nice to not save the dynamically scaled version because that would not work with users wo don't use poppy-print. So only the normal poppy printed version is written to the source file.