Replace deprecated Text_Diff PEAR package with Horde Text_Diff

This patch replaces obsolete Text_Diff PEAR package with newer and still
maintained Horde Text_Diff version 2.2.0 as sugges

Replace deprecated Text_Diff PEAR package with Horde Text_Diff

This patch replaces obsolete Text_Diff PEAR package with newer and still
maintained Horde Text_Diff version 2.2.0 as suggested in the packages
descriptions.

Since bugs.php.net production is not ready for Composer installations yet,
the Text_Diff package is bundled in the Git repository directly. Its
classes are not compliant with PSR-4 yet so the classmap has been used
until future PSR-4 migration and refactorings.

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