This class had slightly confusing semantics and the added weirdness
doesn't seem worth it just so we can say "." instead of "->" when
iterating over a vector of NNRPs.
This patch replaces NonnullRefPtrVector<T> with Vector<NNRP<T>>.
For example, in Solitaire, the vertical normal stacks cover the suit of
all but the topmost card in the stack. To see the suit of covered cards
the user currently has to move the cards on top of them out of the way.
This adds an API for games to set a card at a location to be previewed,
which will draw that card on top of all other cards without moving it.
Gfx::Color is always 4 bytes (it's just a wrapper over u32) it's less
work just to pass the color directly.
This also updates IPCCompiler to prevent from generating
Gfx::Color const &, which makes replacement easier.
We have a new, improved string type coming up in AK (OOM aware, no null
state), and while it's going to use UTF-8, the name UTF8String is a
mouthful - so let's free up the String name by renaming the existing
class.
Making the old one have an annoying name will hopefully also help with
quick adoption :^)
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.
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.
