Currently the user needs to set bold/italic fonts, which may not always exist.

This task proposes to automatically calculate bold and italic fonts.

• Italic: adjust slant with slider for how much to slant the text.
• Bold: thicken the font by expanding the curve before tessellation.

Note, automatic bold-creation is very likely to cause self intersection, we may need to improve filling before this is practical, or - filling may need to be performed on un-expanded charactersl