[Objects] Add fix_z column to ground spawns (#3992)

* [Objects] Add is_floating column to objects/ground spawns

# Notes
- Allows ground spawns/objects to float without having `FixZ()` called.

* Remove from object.

* Database version

* Fix

* Change to fix_z

common/database/database_update_manifest.cpp

@@ -5241,6 +5241,17 @@ DROP TABLE IF EXISTS item_tick
 		.sql = R"(
 ALTER TABLE `spawngroup`
 MODIFY COLUMN `name` varchar(200) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL DEFAULT '' AFTER `id`;
+)"
+	},
+	ManifestEntry{
+		.version = 9257,
+		.description = "2024_01_16_ground_spawns_fix_z.sql",
+		.check = "SHOW COLUMNS FROM `ground_spawns` LIKE `fix_z`",
+		.condition = "empty",
+		.match = "",
+		.sql = R"(
+ALTER TABLE `ground_spawns`
+ADD COLUMN `fix_z` tinyint(1) UNSIGNED NOT NULL DEFAULT 1 AFTER `respawn_timer`;
 )"
 	}
 // -- template; copy/paste this when you need to create a new entry