add a config_token function to look for a token inside a list

src/economy.c

@@ -731,7 +731,7 @@ static bool maintain(building * b, bool first)
         return false;
     }
     /* If the owner is the region owner, check if dontpay flag is set for the building where he is in */
-    if (check_param(global.parameters, "rules.region_owner_pay_building", b->type->_name)) {
+    if (config_token("rules.region_owner_pay_building", b->type->_name)) {
         if (fval(u->building, BLD_DONTPAY)) {
             return false;
         }

src/kernel/building.c

@@ -591,7 +591,7 @@ static unit *building_owner_ex(const building * bld, const struct faction * last
             }
         }
     }
-    if (!heir && check_param(global.parameters, "rules.region_owner_pay_building", bld->type->_name)) {
+    if (!heir && config_token("rules.region_owner_pay_building", bld->type->_name)) {
         if (rule_region_owners()) {
             u = building_owner(largestbuilding(bld->region, &cmp_taxes, false));
         }

src/kernel/config.c

@@ -1587,6 +1587,10 @@ double config_get_flt(const char *key, double def) {
     return get_param_flt(global.parameters, key, def);
 }
 
+bool config_token(const char *key, const char *tok) {
+    return !!check_param(global.parameters, key, tok);
+}
+
 /** releases all memory associated with the game state.
  * call this function before calling read_game() to load a new game
  * if you have a previously loaded state in memory.

src/kernel/config.h

@@ -279,6 +279,7 @@ extern "C" {
     const char *config_get(const char *key);
     int config_get_int(const char *key, int def);
     double config_get_flt(const char *key, double def);
+    bool config_token(const char *key, const char *tok);
 
     bool ExpensiveMigrants(void);
     int NMRTimeout(void);

src/reports.c

@@ -1397,7 +1397,7 @@ static void prepare_reports(void)
         }
 
         /* Region owner get always the Lighthouse report */
-        if (bt_lighthouse && check_param(global.parameters, "rules.region_owner_pay_building", bt_lighthouse->_name)) {
+        if (bt_lighthouse && config_token("rules.region_owner_pay_building", bt_lighthouse->_name)) {
             for (b = rbuildings(r); b; b = b->next) {
                 if (b && b->type == bt_lighthouse) {
                     u = building_owner(b);