Removes all objects from the package's storage environment
(.fundsr_storage). Optionally also clears the fund-index map
(.fundsr$fund_index_map).
See also
Other fund/index workflow functions:
add_data_loader(),
build_all_series(),
clear_data_loaders(),
get_storage(),
join_env(),
load_fund(),
run_data_loaders(),
store_timeseries()
