Implement various tag systems for use in game design

[JadenBalogh]

This should be split into 3 categories so far, each defined by an enum type:

• Traits: these are used for setting specific creature genuses, for use in dialogue, combat abilities, immunities and other such things (ex. Human, Duck, Undead)
• Statuses: these are temporary effects that apply some stats or simply flag when active (ex. Stunned, Blessed, Burning). Used for combat, dialogue, etc.
• States: these are agent-specific tags used within behaviours or as general flag (ex. Idle, Patrolling, Attacking)