NPCs will seek to the last point they saw the player at.

The current implementation is complete garbage but the behavior is
pretty neat.  With that said, this commit serves as a proof-of-concept
and should probably be re-written if this behavior is to be worked into
the game.

Signed-off-by: suicidepills <atom.mac@gmail.com>
Make NPCs alternate states patrol and seek (messy commit!).

Merge branch 'seek-experimental' of https://github.com/suicidepills/hack-n-slash-sprint into npc-state-switching

Conflicts:
	js/entities/npc.js

Signed-off-by: Zach Bennett <xslingshot@gmail.com>