
List proposals

Parameters:
    start: - starting value for querying results, (type: fc::variant)
    limit: - query limit, (type: uint32_t)
    order_by: - name a field for sorting operation, (type:
	database_api::sort_order_type)
    order_type: - set print order (ascending, descending) (type:
	database_api::order_direction_type)
    status: - list only results with given status (all, inactive, active,
	expired, votable), (type: database_api::proposal_status)
