Fix pear diff php deprecations

[marcovtwout]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌
Tests pass?	✔️
Fixed issues	#4534

[what-the-diff]

PR Summary

• Bug Fix for PHP 8.2 Compatibility
  The 'gii/components/Pear/Text/Diff' part of our software had an outdated approach to handling dynamic properties, which was causing issues with the newer version of PHP (8.2). That issue is addressed and fixed now.

  • File impacted: framework/gii/components/Pear/Text/Diff.php

• Enhancements in Text_Diff_Engine_native Class
  We've added public properties to the Text_Diff_Engine_native class. It'll improve the way this class interacts with the other parts of our software, leading to an overall improved performance.

  • File impacted: framework/gii/components/Pear/Text/Diff/Engine/native.php

• Improvement in Mapped Class Constructor Invocation
  We've improved the way the 'Mapped' class's constructor is invoked in 'gii/components/Pear/Text/Diff/Mapped.php'. As a result, the Mapped class will now initialize more effectively.

  • File impacted: framework/gii/components/Pear/Text/Diff/Mapped.php