Uniform width for decoration items

[hilaire]

So far we have decoration items coming with two different absolute widths:
 - breakfast, table items at 64 width
 - fruits at 160 width

We should set an unique width of 160 for all these items. Depending on the wished width, the items will be scaled accordingly to a small or large wished physical width (64 or 160).

Note: all this physical extents are rescaled depending on the overall iStoa app window extent.

Of course we should have something like:
#orange and #organgesm selectors depending on whish one we want to use.