Addressed some issues, added more bug fixes, and further rebalancing

Changelog
+ Monsters now glow when only 20% of total enemies remain

- Removed spectral arrows from shop

* Moved cooldown messages and gem pickup messages to action bar chat
* Cooldown time is now a different color from the rest of the warning message
* Special abilities will no longer trigger when the shop, food, or glass bottles are held in the main hand to prevent accidental triggers
* Increased loudness of player death sound
* Player spawns are now sensitive to pitch and yaw
* Simplified certain game item enchant generation
* Fixed an issue where arena portal NPCs were not rotating
* Fixed an issue where shift-clicking item into custom inventories was possible, resulting in loss of item
* Fixed issue where deleting leaderboards or lobby was broken
* Fixed an issue where arena clearing did not account for experience orbs