Artist typing updates

[mehulsinha73]

This issue aims to update the types of artists from GENERAL, AGENT, GRAPH to more generalized types like STATIC and DYNAMIC. The exact type updates are

class ArtistType(Enum):
    STATIC = auto()
    DYNAMIC = auto()

class RenderMode(Enum):
    CACHED = auto()
    NON_CACHED = auto()

where the default mapping would be STATIC -> CACHED, DYNAMIC -> NON_CACHED, but can be overridden.