feat: add steam_disk_space egg feature to SteamCMD eggs

A new egg feature modal was introduced in Panel v1.7.0 triggering when server has run out of disk space to provide more user-friendly instructions to both admins and normal users. This is unique to SteamCMD specific errors.

game_eggs/steamcmd_servers/quake_live/egg-quake-live.json

@@ -7,7 +7,9 @@
     "name": "Quake Live",
     "author": "patz.michael@gmail.com",
     "description": "Quake Live is a first-person shooter video game by id Software. It is an updated version of Quake III Arena that was originally designed as a free-to-play game launched via a web browser plug-in. On September 17, 2014, the game was re-launched as a standalone title on Steam.",
-    "features": null,
+    "features": [
+        "steam_disk_space"
+    ],
     "image": "quay.io\/parkervcp\/pterodactyl-images:ubuntu_source",
     "startup": ".\/qzeroded.x64  +set net_port \"{{SERVER_PORT}}\" +set sv_hostname \"{{SERVER_NAME}}\" +set sv_serverType \"{{SERVER_TYPE}}\" +set g_password \"{{PASSWORD}}\" +sv_fps \"{{FPS}}\"",
     "config": {
@@ -70,4 +72,4 @@
             "rules": "required|numeric"
         }
     ]
-}
+}