Changelog - Version 2.1.0-neoforge1.21.1

Added

1. ME Cable Placement Tool - A new tool for efficiently placing AE2 cables with three modes:
   1. Line Mode - Place cables in a straight line between two points
   2. Fill Mode - Fill a plane area with cables
   3. Branch Mode - Create branching cable networks from a starting point
2. Smart Dyeing System - Automatically dyes cables using dye items from your inventory or ME network
3. Key of Spectrum Upgrade - When inserted, enables expanded color selection for cable placement
4. Undo Functionality - Ctrl + Left Click to undo cable placements, returning cables (with correct color) to inventory or ME network
5. Add dolls featuring the author's likeness

Improved

1. Cable Tool GUI - Complete GUI with color selection bars and shortcut color bar for quick access
2. Color Selection UX - Color bars now require Key of Spectrum upgrade to be inserted; displays tooltip when upgrade is missing
3. Multiblock BFS Algorithm - Optimized with MAX_CANDIDATES limits and proper candidate expansion logic to prevent infinite loops and lag
4. REI Compatibility - Added support for Roughly Enough Items (REI) alongside existing JEI integration