improve multilineSize for text calculations

[michaelknoch]

Type of change: layouting fix

Motivation (current vs expected behavior)

I noticed that there is too much space above and below UILabels especially when using bigger font sizes. Removing the hack numberOfRandomExtraLinesRenderedBySDLTTF seems to fix it. Maybe the rendering behaviour got fixed by updating SDLTTF?

before:

after:

Please check if the PR fulfills these requirements

• [ ] Self-review: I am confident this is the simplest and clearest way to achieve the expected behaviour
• [ ] There are no dependencies on other PRs or I have linked dependencies through Zenhub
• [ ] The commit messages are clean and understandable
• [ ] Tests for the changes have been added (for bug fixes / features)

[codecov[bot]]

Codecov Report

Merging #327 (dc7be26) into master (27b83c3) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #327   +/-   ##
=======================================
  Coverage   51.22%   51.22%           
=======================================
  Files          87       87           
  Lines        2899     2899           
=======================================
  Hits         1485     1485           
  Misses       1414     1414           

Impacted Files	Coverage Δ
Sources/FontRenderer.swift	58.13% <ø> (ø)

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