Code Style: Magic Numbers and Strings

[wurstbroteater]

In the project, there are several occurences of so called magic numbers like here: #53 (comment)

Also there are occurences of unclear REGEX usages like here: #53 (comment) and #53 (comment)

It is not OS save to use \n, so we have to change it to String.format("%n") and StringBuilder should be used in general

This issue is considered as done if:

• All unclear magic numbers are identified and documented (optional: in wiki)
• The purpose or usage of the magic number has been documented (optional : in wiki)
• The purpose or usage of the REGEX Strings has been documented (optional : in wiki)
• All occurences of \n have been changed to String.format("%n")
• Every usage of String is be replaced with StringBuilder ( this also includes String concatenation with +)