Investigate converting constant dicts to enums

[kevinbarabash]

e.g.

export const action = {
    FETCH_PERMISSIONS: ("FETCH_PERMISSIONS": "FETCH_PERMISSIONS"),
    RECEIVED_PERMISSIONS: ("RECEIVED_PERMISSIONS": "RECEIVED_PERMISSIONS"),

    FETCH_ROLES: ("FETCH_ROLES": "FETCH_ROLES"),
    RECEIVED_ROLES: ("RECEIVED_ROLES": "RECEIVED_ROLES"),

    ...
};

could be converted to

export enum action {
    FETCH_PERMISSIONS = "FETCH_PERMISSIONS",
    RECEIVED_PERMISSIONS = "RECEIVED_PERMISSIONS",
    FETCH_ROLES = "FETCH_ROLES",
    RECEIVED_ROLES = "RECEIVED_ROLES",
    ...
}

This feels more idiomatic than what was suggested in #254.