(#1704) Implement a Multiline Text

[fabriciofx]

Implements a Multiline Text.

[pnatashap]

If I can still calculate correctly, the string 'The quick brown fox jumps over the lazy black dog and after that returned to the' is exactly 80 symbols which is the default value, so looks like expected value is wrong.
The problem is in size variable during calculation, you always add SPACE

[fabriciofx]

@pnatashap Can you take another look, please?

[pnatashap]

Now it works fine, several points that it is not easy to understand (just my point of view):

1. StringBuilder with line is current word or this word with space, not sure that we need separate builder for this.
2. Not very clear that we try to check current word and the next word in one iteration, it looks like can be simplified

[pnatashap]

@yegor256 @victornoel please take a look