BillboardZ bugfix for Max2DTS Exporter

A BillboardZ is a mesh that rotates to face the viewer, but unlike a regular Billboard, will only rotate about it's Z axis. You flag a mesh as a Z billboard in Max by prefixing it's name with the special flag "BBZ::", but the max exporter fails to export BillboardZ meshes correcty.

This is a one line fix. Open the file ShapeMimic.cc and make the change I have indcated below:

//--------------------------------------------
// get object from object list -- create if not present
ObjectMimic * ShapeMimic::getObject(INode * pNode, char * name, S32 size, S32 * detailNum, F32 multiResPercent, bool matchFull, bool isBone, bool isSkin)
{
   // if already encountered an error, then
   // we'll just go through the motions
   if (isError()) return NULL;

   S32 i;

   // if this is a billboard object, detect that now and adjust name accordingly
   // Note: billboard objects are named BB::* (the BB:: is dropped from here on).
   // phdana BBZ fix ->
   bool billboard = pNode ? (SceneEnumProc::isBillboard(pNode)||SceneEnumProc::isBillboardZAxis(pNode)) : false;
   // <- phdana BBZ fix
   bool sortedObject = pNode ? SceneEnumProc::isSortedObject(pNode) : false;

 ...more code

The rest of the code handles BillboardZ meshes just fine but this one bug keeps that code from executing.