rename VERA_12B font to SANS_12B (as in sans-serif). This is a "Grotesk"

rename VERA_12B font to SANS_12B (as in sans-serif). This is a "Grotesk"
font similar to Helvetica/Swiss. The license doesn't allow to redistribute
modified fonts under the original name. While it's only a converted font,
and not manually modified, it can no longer be seen as original. Changes
so far are (a) conversion from vector to bitmap, (b) different empty space
width, (c) different & constant gap value, without other kerning information.
Further changes may be necessary in the future.