[Zones] Convert IDLE_WHEN_EMPTY to a Zone Column (#3891)

* [Rules] Convert IDLE_WHEN_EMPTY to a rule

# Notes
- Converts `IDLE_WHEN_EMPTY` to `Zone:ZonesIdleWhenEmpty` so that we can change this on the fly or on a zone-by-zone basis instead of having to recompile to do this.
- Especially helpful for those using release binaries that do not compile their own source.

* Convert to zone column.

* Update ruletypes.h

* Update ruletypes.h

* Update entity.cpp

* Update entity.cpp

* Rename.

* Update database_update_manifest.cpp

* Update base_zone_repository.h

* Update zone.cpp

* seconds_before_idle

* Update database_update_manifest.cpp

* Getter/Setters/Private

* Update base_zone_repository.h

* IsIdle()/SetIsIdle()

* Update entity.cpp

common/zone_store.cpp

@@ -1341,3 +1341,37 @@ int ZoneStore::GetZoneMinimumLavaDamage(uint32 zone_id, int version)
 
 	return 0;
 }
+
+uint8 ZoneStore::GetZoneIdleWhenEmpty(uint32 zone_id, int version)
+{
+	for (auto &z: m_zones) {
+		if (z.zoneidnumber == zone_id && z.version == version) {
+			return z.idle_when_empty;
+		}
+	}
+
+	for (auto &z: m_zones) {
+		if (z.zoneidnumber == zone_id && z.version == 0) {
+			return z.idle_when_empty;
+		}
+	}
+
+	return 1;
+}
+
+uint32 ZoneStore::GetZoneSecondsBeforeIdle(uint32 zone_id, int version)
+{
+	for (auto &z: m_zones) {
+		if (z.zoneidnumber == zone_id && z.version == version) {
+			return z.seconds_before_idle;
+		}
+	}
+
+	for (auto &z: m_zones) {
+		if (z.zoneidnumber == zone_id && z.version == 0) {
+			return z.seconds_before_idle;
+		}
+	}
+
+	return 60;
+}