Add ProximityTrigger v2.1.0 - Proximity-based automation system

New API Script: ProximityTrigger v2.1.0

A proximity-based automation system for Roll20 that automatically triggers
events when player tokens approach designated areas, NPCs, traps, or other
game elements.

Features:
- Automatic proximity detection with customizable distances
- Configurable cooldowns and trigger modes (on/off/once)
- Weighted random message selection for variety
- Styleable message cards with whisper modes
- Support for NPCs, traps, environmental descriptions, and more
- Full chat-based configuration interface
- Multi-token support

Includes comprehensive README and documentation.

Author: bbarrington0099