Added ext requirements to composer
Removing invalid double separation for array parameters
Fix multidimensional array assignment, as variable, normal/static property

- Include tests for each type
String parameters must be copy-on-write'd when they're already strings
Support for hash pointer globals
Export destructors from config.json to extension
RETVAL_ZVAL_FAST needs more tests, fixing incremental build
Avoid SkipVariantInit when variable is used in evaluated expression
Merge pull request #562 from ovr/composer_use

Added ext requirements to composer
Merge pull request #575 from steffengy/fix-array-mod

Fix normal multi dimensional array assignment
typeof operator did not work with local variants
Try to migrate to extension usage