comments in cascades and blocks should be formatted without new lines

[kdauer]

Problem to solve

As Squeak Developer, I want a comment within a cascade or block to be written without a newline so that the intended formatting stays the same.

Further details

relates to #34

Example:
Before:

Expected:

Output:

Acceptance Criteria

• Given a cascade or a block with a comment, when formatting with poppy-print, put comments at the end of lines instead of at the end of the cascade/block.

[Yannis-Hofmann]

This seems to already work with blocks.