(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.

include/file.h

@@ -118,15 +118,16 @@ enum {
     EF_LOST,
     EF_REALM,
     /* Static game data (configuration) */
+    /* Order is relevant; see read_builtin_tables() */
+    EF_ITEM,
+    EF_PRODUCT,
     EF_SECTOR_CHR,
     EF_SHIP_CHR,
     EF_PLANE_CHR,
     EF_LAND_CHR,
     EF_NUKE_CHR,
     EF_NEWS_CHR,
-    EF_ITEM,
     EF_INFRASTRUCTURE,
-    EF_PRODUCT,
     EF_TABLE,
     EF_META,
     /* Symbol tables */