Same ole Atlas Clipmap bugs

We've been busy working on things, but it seems now that we have some other people outside of our team testing things, we're seeing a crash that has been consistent since early TGEA builds.

That is in AtlasClipMapImageSource::copyBits

Specifially

else if( bitmap->bytesPerPixel == 3 )
            {
               // Do a fast little copy
               const U8 *curIn = bmpBits;
               const U8 *endIn = (bmpBits + numPixels * 3);
               U32 *curOut = (U32*)outBits;

               while(curIn < endIn)
               {
                  *curOut = (*(U32*)curIn) & 0x00FFFFFF;
                  curIn+=3;
                  curOut++;
               }
            }

We have a couple terrains which crash inside the while loop on the *curOut line. This doesn't seem to happen for everybody though. I see that if the bytesPerPixel was 4, it just would do a pretty straight forward copy. I don't guess it is possible to just "update" to that lol..

Anyways, this has been around awhile unfortunately