Add geoip_base module, which sets "geo_country" if a geo provider

module is able to lookup the IP and return a country.

Also consistently use geoip_ and GEOIP_ prefixes.

include/h.h

@@ -1129,4 +1129,4 @@ extern char *timestamp_iso8601(time_t v);
 /* end of logging */
 extern void add_fake_lag(Client *client, long msec);
 extern char *prefix_with_extban(char *remainder, BanContext *b, Extban *extban, char *buf, size_t buflen);
-extern char *geo_lookup(char *ip);
+extern char *geoip_lookup_country(char *ip);

include/modules.h

@@ -2272,7 +2272,7 @@ _UNREAL_ERROR(_hook_error_incompatible, "Incompatible hook function. Check argum
 #define CALLBACKTYPE_CLOAK_EX 3
 #define CALLBACKTYPE_BLACKLIST_CHECK 4
 #define CALLBACKTYPE_REPUTATION_STARTTIME 5
-#define CALLBACKTYPE_GEO_LOOKUP 6
+#define CALLBACKTYPE_GEOIP_LOOKUP 6
 
 /* To add a new efunction, only if you are an UnrealIRCd coder:
  * 1) Add a new entry here