clickanddraw and drawnumber, ported from the Gtk+ version
core, moved QCryptographicHash from cpp to .h

This symbol is used in the .h and it fails to compile
on some platforms.
little fix for translation
little fixes and factorisation for settings
scalesboard, initial port of this activity
Merge branch 'scalesboard'
scalesboard, added a background image

The image comes from openclipart:
https://openclipart.org/detail/192974/supermarket-chiller-by-viscious-speed-192974