Improve the rendering of the magnifier

QT: PDF layer can be moved by using "Arrow"
SANKORE-537
with mask, masking ruler or compass..., the pointer changes of icon when it comes on the tool, but we can't do nothing because it's behind the mask

added routeDataItem to write on disk on only once the file. Pay attention that QDir("tmp") on windows doesn't works because we don't have the right for writing there.

PDF: Pictures in PDF change their size

PDF : Sankore overwrite Pdf layer to empty, after picture(shape) was "set as background"