Volatile Statuses - Batch 1

Addresses Issue #136

Updates

Adds the following Volatile Statuses to the Engine

engine_tests/pokemon_engine_test.py

Baneful Bunker (single-turn volatile status) is used, volatile status is cleared at the end of the turn
Laser Focus (2-turn volatile status) is used, volatile status is not cleared until the end of the next turn
A pokemon under Torment has the move updated each turn
If a Pokemon has Flinch as a Volatile status, it does not attack (attack returns None)
A pokemon with the Attract volatile status will be immobilized
Volatile statuses that last a certain number of turns (ex: Heal Block) only last for that long
Volatile Statuses that activate at the end of a turn (ex: Aqua Ring) have their effects applied at the end of a turn misc_tests/moves_test.py
A pokemon with Laser Focus as its volatile status will always get a critical hit
Moves with Volatile Statuses as secondary effects apply those appropriately
Autotomize correctly lowers the weight of a pokemon misc_tests/pokemon_test.py
When a Pokemon cannot make a move under Torment, it struggles (raises NotImplementedError)
Taunt prevents the use of status moves
Heal Block prevents the use of healing moves
Confusion Damage is calculated properly
The method to set volatile statuses works correctly
End-of-turn volatile status effects work properly