Add some output_xxx() functions so we can print strings that don't come from resources.
Also protect against buffer overflows in output_vprintf() and constify the output_xxx() functions.

usp10: When calling ShapeIndicSyllables we need to use cChars which is the actual number of original characters.

The pixelformat is passed in in ddraw form in the desc parameter, which is copied
into the surface's DDSURFACEDESC2 structure, so the format is already set.