Add printer-specific post-processing scripts configuration

[Copilot]

This PR adds the ability to configure post-processing scripts at the printer level, allowing users to define scripts that run automatically for all prints using a specific printer configuration.

Changes Made

1. New Configuration Option

• Added printer_post_process configuration option to the PrintConfig class
• Separate from existing print-level post_process to avoid conflicts
• Supports the same format: semicolon-separated script paths with multiline support

2. User Interface

• Added "Post-processing Scripts" section to Printer Settings → Machine gcode page
• Consistent styling with existing post-processing UI
• Full-width text area with code syntax highlighting

3. Enhanced Execution Logic

• Modified run_post_process_scripts() to handle both printer-level and print-level scripts
• Execution order: Printer scripts run first, then print scripts
• Clear logging to distinguish between script types
• Maintains full backward compatibility

Use Cases

• Printer-specific modifications: Add custom G-code for specific printer features
• Python script support: Perfect for custom Python post-processing scripts
• Temperature adjustments: Modify settings based on printer capabilities
• Custom macros: Insert printer-specific macro calls
• File format conversions: Convert G-code to printer-specific formats

Example Usage

Configure in Printer Settings:

/path/to/printer_setup.py;/path/to/temperature_adjust.py

Example Python script:

#!/usr/bin/env python3
import sys
import os

gcode_file = sys.argv[1]
host = os.environ.get('SLIC3R_PP_HOST')

# Add printer-specific header
with open(gcode_file, 'r') as f:
    content = f.read()

modified = f"; Processed for {host} printer\n" + content

with open(gcode_file, 'w') as f:
    f.write(modified)

Backward Compatibility

• Existing print-level post-processing scripts continue to work unchanged
• No breaking changes to existing functionality
• Can be used alongside existing print-level scripts

Files Modified

• src/libslic3r/PrintConfig.hpp - Added printer_post_process config option
• src/libslic3r/PrintConfig.cpp - Configuration definition with tooltips
• src/slic3r/GUI/Tab.cpp - UI integration in printer settings
• src/libslic3r/GCode/PostProcessor.cpp - Enhanced execution logic

Fixes #1.

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