Rework method stubbing, mocking

[tomaszdurka]

Allow more flexible method/function stubbing and mocking.

Allow:

$instance = new Foo();
$mocka->stubMethod($instance, 'bar');

EDIT:

Original idea has been postponed. It requires runkit support plus some preparations. Instead I went with preparations only. All the mechanics of how methods are overridden and where overrides are stored have been reworked.

There is central place (Manager) for all overrides. It will allow redefining single methods/functions in future using runkit. Code looks more understandable now.

Deprecation notes:

Some methods like #mockMethod, #unmockMethod are deprecated now. New way to override method is:

$mocka = new \Mocka\Mocka();
$date = $mocka->mockObject(\DateTime::class);
$spy = $date->getOverrides()->spy('add');
$stub = $date->getOverrides()->stub('format')->set('formatted');
/** @var DateTime $date */
$date->add(new DateInterval('PT1H'));
echo $date->format('U');
$this->assertSame(1, $spy->getCallCount());
$this->assertSame(1, $stub->getCallCount());
$this->assertSame('U', $stub->getInvocations()->getLast()->getArgument(0));

[tomaszdurka]

@alexispeter wanna review? :)

[alexispeter]

Sure

[tomaszdurka]

Will go ahead and merge this one. Release a tag and test it, please let me know if I should adjust some fixes - it's a but off-topic project so no priority.