Fix v2.3 to allow mock with a `types` array such as ['class', 'interface1']

[nthachus]

• Fix Generator class to allow mock with an array of types such as ['interface1', 'interface2'], ['class', 'interface1', 'interface2']
• Support 'parent' as proxyTarget to mock alternate methods correctly
• Add more unit-tests to cover classes Generator, MockBuilder
• Support mockClassName within a namespace, e.g. $this->getMock(['NS\Foo', 'ArrayAccess'], ['foo'], [], 'Bar\Foo\MockFoo');
• Support proxied mocking with invocation return instead of original method if invocation result is not null

[sebastianbergmann]

Thank you for your contribution. I appreciate the time you invested in preparing this pull request. However, I have decided not to merge it.

Version 2 of this component is no longer supported. The oldest version of this component that is supported is version 5 (used by PHPUnit 6.5).

Pull requests for new functionality need to be made against master, pull requests for bug fixes against 5.0.