Migrate SKIPIF -> EXTENSIONS (#7138)

This is an automated migration of most SKIPIF extension_loaded checks.

Trim trailing whitespaces and fix code style

Closes GH-5554.

- add ZipArchive::EM_UNKNOWN constant - add ZipArchive::EM_TRAD_PKWARE constant - cleanup hack for libzip 1.3.1 (have only exist for a few days) - add ZipArchive::isCompressionMethodSupported() metho

- add ZipArchive::EM_UNKNOWN constant - add ZipArchive::EM_TRAD_PKWARE constant - cleanup hack for libzip 1.3.1 (have only exist for a few days) - add ZipArchive::isCompressionMethodSupported() method (libzip 1.7.0) - add ZipArchive::isEncryptionMethodSupported() method (libzip 1.7.0) - bump version to 1.19.0-dev

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