Do not overwrite download status from DB when thumb/info are get on the fly....

Do not overwrite download status from DB when thumb/info are get on the fly. This fix download indicators over icon view items.
Do not overwrite file mtime get at camera connection when metadata are updated with thumbnails. This fix Ordering of icon view items.
Fix loop to get download status. No need to copy map.
Improve and simplify icon-view loop to refresh items depending of sort order.
Less CameraIconItem dependency to preprare camera Icon View Qt4 model/view port.
BUGS: 260669
BUGS: 246336