use a vec of entities instead of children

[tomara-x]

• avoids some of the stuff we had to do in 85faab3 #114 (we can just remove the entity)
• manual transform propagation allows for custom behavior (fixing transform propagation issues #111)
• make_children_change won't be needed (move them manually)

[tomara-x]

can we use children for things like highlights and info texts now? (after you're done)

[tomara-x]

• this would mean you'd have to rewrite delete (when deleting a hole make sure to remove it from its parent's vec, and when deleting a parent delete holes first)...
  doubt..

• need a parent field for each wh and bh [why?! pls! always write why! can't we just do the double get?]

[tomara-x]

nope, nope

[tomara-x]

hiding is no more use here

[tomara-x]

for now at least, don't propagate anything, will have a command to select children.
and maybe that :add command? for delta kind of movement

[tomara-x]

find all global transforms after you're done, and clean all of that done

[tomara-x]

cleanup in aisle move_selected done

[tomara-x]

find any use of Parent done

[tomara-x]

they're no longer parented, so they're all there in the sceneinstance.. post needs a rewrite done