Avoid calling backlog when Home key is pressed in TextInputField

Added functionality to prevent calling the backlog when the Home key is pressed while typing in the TextField. The hotkeys could be called even while typing in the TextInputField. I found out that the following part from TextInputField::Update was causing this
```
    if (state == DEACTIVATING)
    {
        state = IDLE;
        typing_active = false;
    }
```
So, I moved typing_active = false closer to the two lines calling Deactivate() in TextInputField::Update().
Using explicit conversion when calling std::signbit() in AnimationWindow::speedSlider::OnSlide() to resolve the warning during compilation.
Moved AnimationWindow::lastDirection to local scope within AnimationWindow::speedSlider::OnSlide(), as it is only used there.

turanszkij / WickedEngine