Reset certain entities when off-screen by a set distance

[Jigoku]

Problem:
If a player activates falling logs, and then backtracks, they may not be able to complete the level.... so make these reset when off screen.

[Jigoku]

physics.lua

if not world:inview(trap) then
	table.remove(trap, i)
end

change to something like

if not world:inextendedview(trap) then
	trap.x = trap.xorigin
	trap.y = trap.yorigin
	trap.falling = false
end

Although another switch should be added, trap should not infinitely fall. Once off screen in falling state, don't move the undrawn trap.

[Jigoku]

Not much of a problem for now, as mapstates have been implemented (resets everything to checkpoint), removing milestone for now.