Added partition_path(). Added cut_path= to *_half()

[revarbat]

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[Copilot]

Pull request overview

This pull request adds advanced partitioning capabilities to the BOSL2 library by introducing customizable cut paths for partition operations. The PR introduces two major new functions (partition_path() and ptn_sect()) and extends all existing *_half() functions to support custom partition cut paths instead of just flat plane cuts.

Changes:

• Added cut_path=, cut_angle=, offset=, show_frameref=, and convexity= parameters to all *_half() module and function variants
• Introduced partition_path() function to create complex partition paths from descriptive patterns
• Introduced ptn_sect() function to create individual partition section shapes with support for pattern transformations
• Refactored all left_half(), right_half(), front_half(), back_half(), top_half(), and bottom_half() modules to delegate to the enhanced half_of() function

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