render attributedstring

[michaelknoch]

Current behavior

attributedStrings render without their attributes as plain strings

Expected behavior

.foregroundColor and .kern is taken into account

Please check if the PR fulfills these requirements

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