Graphics.setFontCustom() firstChar

@jgw,

the fist char is used to cut out chars before the first char you actually want to provide and 'cut out /safe the space' for the chars before within a 'regular' / ASCII char set, and then only provide 10 chars, for example for numeric or other special font...

As many other Espruino uniques, resources / frugality - and still make it - are guide for design and implementation.

I know from (very long time) past that some systems did chose the 2nd 16 chars for all the special chard, such as Umlaute and accents, because it was still 7-bit world, and still leave the basic control chars alone.