Overhaul traning to be associated internally with state

[mattdelsordo]

Modify training system first before adding hunger to make the latter process more manageable.

What I want to do is have the states keep track of energy cost/exp/state transitions/etc. in a way that creates sort of a state machine managed by the state classes themselves. That way, the UI can just send a message to the Friendo object that will say "do crunches" and the Friendo will either transition to that state and start exercising automatically or not change state due to a lack of transition from the state it's currently in.

[mattdelsordo]

Refactor all states to include:
Fields:

• "schedule": > 0 if exercising, 0 if done exercising, -1 for infinite/not timed (sleep and idle)
• fatigue modifier
• exp modifier
• associated stat (for exercises, null for others)

Methods:

• "tick()": called on each behavior tick (separate from animation tick?), updates schedule, applies fatigue/exp modifiers, checks whether to update state
• handleAction(): interprets action input from player, transitions to other states based on current state
  • idle -> exercise
  • cancelled exercise -> idle
  • not sure whether to also use this for internal state transitions e.g. exercise -> sleep/sleep -> idle