Add poppy-print to the preferences browser to support custom coding styles

[Yannis-Hofmann]

Problem to solve

As Squeak Developer, I want to enable or disable Poppy Print settings in the Preference Browser, so that I can customize my Poppy Print experience.

Further details

Acceptance Criteria

• when opening the Preference Browser, it should be possible to open a Poppy Print-page
• on this page, for each configurable styling parameter, there is an enable button
• if the button of a specific styling parameter is blackened, the parameter is enabled until the button is switched off

[EnnioEnnio]

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