Randomize on reset fix

[mandjevant]

I noticed that only the knapsack-v0 environment had the randomize_on_reset attribute implemented on reset. I added this to the other knapsack environments.

env = or_gym.make('Knapsack-vX', env_config={'randomize_params_on_reset': True})

Also in this PR:

• Add .idea/ to .gitignore
• Remove redundant print comment in utils | assign_env_config()
• Promote the use of local variables instead of adding class attributes by raising an attribute error if a parameter in env_config is not a default attribute.
• Add Knapsack-v3 to the ENV_LIST in version.py

[osarwar]

@mandjevant Thanks so much for your contribution!