(ichr, pchr, dchr, intrchr): Move initializer to new builtin config

(ichr, pchr, dchr, intrchr): Move initializer to new builtin config
files item.config, product.config, sect.config, infra.config.
(empfile): Declare the new config files.  Reorder table entries so
that read_builtin_tables() reads the config files in the right order.

(bigcity_dchr, opt_BIG_CITY, init_dchr): Remove.  Deities can edit
sect.config instead.