This adds config options for the colors used for the store text
and background when displaying the store name in the single
card view or the thumbnail for the card list.
This changes the layout when viewing a single card. The new layout
will have a colored area at the top which displays the first letter
of the company, and after that the barcode. The note will be displayed
on the card list screen and is presently omitted here.
As this layout is experimental, the layout for editing a card is
not yet updated. To achieve this the card viewing activity is split
into two separate classes, where one handles viewing and one handles
editing. When the view layout finalizes the edit icon can be updated
as time allows.
