Fit a 16x16 peg into a 16x16 hole

[marrus-sh]

This should be possible, smdh!

[marrus-sh]

This is actually already fixed if everything is lined up PERFECTLY… but take the following case:

		⬛
	🐊	⬛

If 🐊 uses TargetBy(1, -1), 🐊 will not go into the gap, because at each calculation the x and y will be a float (and thus a little above, or a little below). Ideally the code would check to see if such gaps are being passed over, and (if possible) try to fit 🐊 in them instead.

[marrus-sh]

(Note: Ideally this should not necessarily be a simple matter of rounding, so that the same holds true if you have two characters at float positions with a similar gap between them, and a third trying to fit between)

[marrus-sh]

Rounding to the nearest pixel may be an appropriate solution to this problem, as it will ensure that any time a sprite looks like it can fit in a hole, it will.

[marrus-sh]

However ^ will not alone solve the problem if the velocity vector is, say, ⟨1, -2⟩ (not possible right now but this may change in the future)

[marrus-sh]

Nearest-pixel rounding has now been implemented, at least