Issue Title: Markdown code tags leave no proper spacing with normal text around it.
Environment: Windows 10 Home, StarUML v5.1
1. Select a model/component.
2. In markdown edit window add some normal text including also code tags (inline code blocks) among with the text. Add also multiple spaces between some text and code tags.
3. View the Markdown in preview mode.
Expected Results: The Preview text should be read easily with proper, and as provided, spacing among normal text and code tags.
Actual Results: Normal text and code tags tend to no having spaces, making it really hard to read. Multiple spaces among text and code tags is missed!
I've done three demonstration experiments in the following image. Three lines where I add text and code tags, including different number of spaces among them. In the Preview mode at the bottom of the image, the text and code tags are in most of the cases collapsed together without any space.