CharacterAction class to represent a character action.

Describes a character in the game world, i.e. an adventurer or an NPC.

Describes an item in the game world, i.e. a sword, a potion, etc.

Describes a location in the game world, i.e. a town, a forest, etc.

Model for a skill that can be performed by a character. e.g. "say <character> <content>", "move <location>", etc.

Exception raised for errors in the action parsing.