- Build the default log path from the DLL's folder, now recorded even
without d4r.ini, instead of copying the name into a MAX_PATH buffer
that a folder path of 246+ characters overflowed; no log is opened
when that folder is unknown
- Fall back to the default when a numeric setting does not start with a
decimal digit, so MarkerPollUs = -1 no longer polls every ~71 minutes;
hex values such as 0x40 still parse
- Decode RGB9E5 exponent 0 as c * 2^-24 instead of zero, and encode with
the format's real maximum 65408 (511 * 2^7) and exponents from 0
- Choose the RGB9E5 exponent by the rounded channel (< 511.5), so a
value such as 511.25 keeps the lower exponent instead of decoding as 512
