A dock that slides into line, and settles squarely on the port

Two things, and the second is the one that was actually wrong.

The lander is slid into place at half a pixel a frame rather than put
there. A dock is allowed eight pixels out in either direction, so
snapping moved it a whole tile in a single frame - a jump, at the very
moment the player was being told they had been careful. The worst gap
closes in about half a second, which reads as the two of them settling
together.

And it settles SQUARELY now. It used to come to rest four pixels out
however carefully it was flown, because the lander is drawn from half a
screen less half a tile - which is what centres an eight pixel lander on
the middle - while the station was drawn from half a screen exactly, so
its left edge sat where the lander's centre was. Both come off the same
origin now, and a gap of nothing puts one exactly above the other.

stationGap is factored out along the way. Three callers wanted it: the
one that draws the station, the one that decides whether it can be docked
with, and now the one that slides the lander in under it. The sideways
ease goes through that wrapped gap rather than the raw positions, because
a dock made either side of the moon's seam has a raw difference of most
of a moon.

---- And the fixtures moved to frame 400 ----

A dock waits to be told its message has been read, and reading a state
file costs a disk read, so a placed run starts a good deal later than a
plain one. The acknowledgement was at frame 100 and stopped working the
day the state file arrived: the program had not reached the dock yet and
the press went by unheard, which shows up as every sprite missing and
reads like a drawing bug. Everything after it is sampled well clear of
both ends.

Two checks, each seen to fail on its own break - the alignment settles at
4,-8 without the shared origin, and the slide reads 0,-8 the whole way
without the easing. Which of the two axes each one actually watches is
written down beside them, because it is not the one you would guess.

Tests/expected/cosmosGrid.out

@@ -22,7 +22,7 @@ Mode.sbx                48
 Flip.sbx                173
 Sprite.sbx              442
 Depth.sbx               672
-Lander.sbx              6692
+Lander.sbx              6814
 Pad.sbx                 264
 Crash.sbx               632
 vars.script             50