impl: `parseWords` never sets `WordsData.isColorSpecified` — words color does not round-trip

[webern]

Same bug class fixed for segno/coda in PR #203. In DirectionReader::parseWords (DirectionReader.cpp:383):

outWords.colorData = getColor(wordEl);
// outWords.isColorSpecified is never set — stays false

getColor() returns an empty ColorData{} when the attribute is absent, so the caller must check checkHasColor and gate isColorSpecified accordingly. DirectionWriter only emits color when isColorSpecified is true, so the color silently drops on write.

Fix

Mirror the pattern already used in getPrintData (PrintFunctions.h:65-68):

if (checkHasColor(&wordEl))
{
    outWords.isColorSpecified = true;
    outWords.colorData = getColor(wordEl);
}

One-liner change; the same fix should be verified for parseRehearsal as well (it has the same call pattern).

References

• PR api: segno and coda suport #203 (fixed this bug for segno/coda; scoped out the parseWords fix)