Remove parameter from onTakeX and onDropX methods

[DmitriyZaitsev]

Presenters have view and router properties available.
At the same time the callback methods onTakeView(v), onTakeRouter(r) have view and router as parameters.
Very often developers launch different async jobs in that methods and capture strong references to views. For minimizing the number of issues related to it, it's better to get rid of those parameters and access views only as presenter's properties.
Also, if you use Kotlin, the property access syntax is available forgetView() and getRouter(), so within the onTakeView you won't need to call this@MyPresenter.view.