improve interaction registry
add deprecated and static method
improve interaction registry
add deprecated and static method
improve interaction registry
add deprecated and static method
refactor registry
Merge branch 'refactor_registry' of git://github.com/oat-sa/extension-tao-itemqti into refactor_registry

Conflicts:
	controller/QtiCreator.php
	model/AbstractInteractionRegistry.php
	model/HookRegistry.php
	test/CustomInteractionRegistryTest.php
	test/HookRegistryTest.php