[NTG-context] Font fallbacks

[Wolfgang Schuster]

Hi,

the \definefontfallback commands use only the last setting in a comma
seperated list.

In this example only characters from 0x0071 to 0x0081 are set in bolditalic.

\definefontfallback [whatever] [BoldItalic] [0x0041-0x0051,0x0071-0x0081]

\definefontsynonym[SerifPlus][Serif][fallbacks=whatever]

\definefont[MySerif][SerifPlus]

\starttext

\MySerif

\dostepwiserecurse{65}{255}{1}
    {\char\recurselevel\hskip10pt plus 5pt\relax}

\stoptext

Wolfgang