PlaceObject3 flags not set correctly

[djcsdy]

RP reports as bug #498010 on Launchpad:

The PlaceObject3 tag is not being set correctly.

Only three bits are reserved, in addition there is a new PlaceFlagHasImage bit, and a new PlaceFlagHasClassName bit.

If hasClassName || (hasImage && hasID) there should additionally be a nul terminated string immediately after the Depth field.

The attached patch glosses over the second part of the condition and adds support for the classname

placeobject.diff

[darpified]

Glad to see work starting back up on this, if there's anything I can help with just ask.