[WIP] Text help

[mrosseel]

First stab at changing the help system to text-based babel compatible text

1. Refactored help system from base.py - removing the original hardcoded help image loading logic
2. New help module structure with three main components:
   - content.py - Text-based help content with internationalization support
   - loader.py - Loading and caching system with page processing
   - rendering.py - PIL image rendering with layout management
3. Key features:
   - Text-based help content that can be translated
   - Dynamic page splitting for long content
   - Navigation indicators ("more" labels)
   - Icon support using Nerd Font glyphs
   - Caching system for rendered images
   - Flexible layout system for different display sizes

The changes maintain backward compatibility while modernizing the help system architecture.