Support windows/mac font names
What steps will reproduce the problem?
In windows open qvim.exe
What is the expected output? What do you see instead?
The Ubuntu Mono font should be selected, with point size 10. Instead an error shows up "Invalid font ..."
Windows and Mac GUIs uses a different format for font names, see :help guifont. To maintain a consistent behaviour we should support both formats.
Some initial support for this should be easy to add, for font name and size. The issue gets more complex depending if we want to