Add option for selected font

[cheebow]

Font of selected item can be specified

[rechsteiner]

Looks great! Thank you 🙌

[gmogames]

@rechsteiner FYI, just in case. Since this was added to the new version, my layout broke because I had set the font to a lighter version during setup and since I did not have a selected font, it used that default bolder version.
Maybe selectedFont could be equal to font instead of equal to exactly the same declaration of font to avoid user having to set both and not break any current layouts out there.

[rechsteiner]

Yeah, that’s a very good point. Will make that part of the next release!