Previously, dropping a card that overlapped multiple stacks that could
accept it, would always choose the stack that came first in the stacks
list, usually the leftmost one. This would feel very odd if the card
was only slightly overlapping the left stack, and 90% over the right
one. So now, we keep looking for closer stacks even once we've found a
valid one.
There may be an option that feels even better, based on the position of
the card being dragged and the card on top of the stack we're dropping
onto, but this already fixes the issue and feels very nice. :^)
Solitaire and Spider have almost identical code for dragging cards from
one stack to another, so it makes sense to move that here. But using
the term "moving" for them, instead of "focused" which (to me at least)
was not clear what it meant.
As part of this, made a const overload for `Card::rect()`. We need the
non-const one too as it's used for modifying the position of a card
that's being dragged. I plan on changing that soon but we'll see.
`CardPainter::set_background_image_path()` immediately repaints the card
back and inverted card back bitmaps if they exist, so users just need
to `update()` that part of the screen. This is handled automatically by
`CardGame`, but other users will have to do this manually.
For now, the only feature of this is that it sets the background colour
from the `Games::Cards::BackgroundColor` config value. Later, other
card game configuration and shared behaviour can go here, to save
duplicating it in each game.
