Features
- Compile under 1.21 and confirm initial support
- New API events triggered when a player joins a war.
- Placeholder to check if a player has admin spy mode enabled.
- Members online count placeholder to the guild list GUI.

Bug Fixes
- Issue where other plugins couldn't access some war events via the API.
- Issue with hotbar switching while in a guild vault.
- Longstanding issue with the /guild list GUI failing to open due to invalid textures across versions. It now falls back to the default texture set in the plugin's config.
- Issue where some admin commands were not executable by console.