Use move functionality for Kitty graphics

[dankamongmen]

Change kitty_wipe() to only set SPRIXEL_INVALIDATED when in SPRIXEL_QUIESCENT, allowing us to use more moves. Introduce sprite_move(), pipe it through to new function kitty_move(). When we can move, it's a drastic reduction in both emitted bytes and flicker over our previous solution of delete+redraw. Closes #1395.

[dankamongmen]

Two problems with this:

• if we move the plane before we raster it the first time, it's never visible (see box)
• we're not properly wiping cells in intro

[dankamongmen]

yeah, if we move the move_ships() to the bottom of the loop in box, they're visible. but this ought work either way.

[dankamongmen]

ok. we are executing pure moves when possible now, but we have to redraw when we wipe or rebuild, so that locks out most of the wins in intro. on the other hand, box does get cut by about half its output, so that's nice.

the next step is to not require full invalidations, by using the animation protocol to wipe and rebuild.