Refactor CHANGE.md to modern Keep a Changelog format with complete history

[Copilot]

This PR completely refactors the project's CHANGE.md file to bring it up to date with modern standards and include all missing changes from 2018-2025.

What Changed

The existing changelog was severely outdated, with the last entry being from June 2018 (Version 2.5.0). Over 7 years of development history was missing, including major features like Android 15+ compliance, OpenGL ES 3.0/3.1 support, and significant architectural improvements.

Improvements Made

🔄 Format Modernization

• Converted from outdated custom format to industry-standard Keep a Changelog format
• Added proper semantic versioning with release dates
• Organized changes into logical categories: Added, Changed, Fixed, Removed

📝 Complete History

• Added all missing changes from 2018-2025 by analyzing git commit history
• Documented major releases: 2.7.0-alpha (2023), 2.6.0 (2022), 2.5.1 (2020)
• Preserved all legacy version information in a collapsible section

🎯 User-Focused Content

• Highlighted meaningful changes that impact developers and users
• Filtered out internal refactoring and focused on breaking changes, new features, and important bug fixes
• Improved English language and professional tone throughout

Key Features Documented

Recent Major Changes:

• Android 15+ compliance with 16KB page size support
• OpenGL ES 3.0/3.1 and compute shader support
• WaveForm and Histogram filters
• CMake build system integration
• Mali GPU compatibility improvements
• NDK23 upgrade and FFmpeg enhancements

Structure:

• Clear section for unreleased changes
• Proper version headers with dates
• Legacy versions preserved but collapsed for readability
• Links to changelog standards for future maintenance

This change transforms a confusing, outdated file into a professional, maintainable changelog that follows industry best practices and provides valuable project history for users and contributors.

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