Started working on storing state for each node. Doesn't run yet though
Added NodeState class to store states on vertices
Migrate Save functionality to ObjectContainer, and use AutoCoding instead of CoreData.
All player attributes are saved except for skills.
Converted all references to PlayerSkill to skill keys. This way, we'd need to only to save the skill keys for PlayerAttributes.
Haven't turned on Save yet.
Turned on save. Able to save skills now.