add missing arginfo for two methods

in PHP-8, presence of arginfo is checked and an E_NOTICE is thrown at
startup if it's missing

update for object handlers being called with zend_object* in PHP 8

for now, there's no ZEND_ENGINE_4 define, so this commit changes many
checks to be based on PHP_VERSION_ID.

Revert testing for SetImageInterpolateMethod to just version comparison.

Although testing for the function availability is technically superior, it is much more difficult to maintain.

Added -Wextra CFLAG. Fixed issues that arose from turning that flag on.

Add PHP 7.3 to travis. Const a const variable.

Extension should conflict with gmagick

All sorts of funny things happen when both gmagick and imagick
are loaded, crashes, assertions etc..

Tidy up version number.

set min version 0x686

bug fixed min version for this method

add method optimizeimagetransparency

Change "Imagemagick" to "ImageMagick"

Change "Image Magick" to "ImageMagick"

Fix #195 segfault by using correct properties size

Added Imagick::setImageAlpha.

Remove TSRMLS for strictly ZE3 code.

deprecate method not available in IM 7, see #162

Change exception class entries for zend engine 3

zend_exception_get_default() has been deprecated (line 48 of zend-exceptions.h) in favor of using zend_ce_exception directly.

ImagickKernel internal state no longer NULL.

The ImagickKernel object contains some internal state that MUST be set to have a valid object. To make this be enforced, the constructor is now p

ImagickKernel internal state no longer NULL.

The ImagickKernel object contains some internal state that MUST be set to have a valid object. To make this be enforced, the constructor is now private, and there are NULL pointer checks in place where the kernel is used.

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Added identifyimagetype method. Listed test files in package.xml

Regression for Imagick Exception classes being final on 7.x

add check for MagickSetImageInterpolateMethod

Updated CFLAGS to warn about implicit function declarations, and fixed the revealed issues.

Exclude Imagick::transformImage and Imagick::orderedPosterizeImage from IM 7 build.

Fixed ifdef around setOpacity and "typo".

Correct version for localContrastImage