Indicates all of the font types which are supported for
use by this host system, specified in a bit-array.
Usage: This bit-array is constructed from the set of
supported values from 'XcmFontType', used as powers of 2
with big-endian rules - the high-order bit of the first
octet corresponds to a font type of '0' (reserved)
- the low-order bit of the first octet corresponds to a
font type of '7'.
Similar to the BITS pseudotype defined in IETF SMIv2
(RFC 2578), which has the same bit ordering rules but
requires definitions for contiguous enumerated bits.