appDisplay: Reset to page 0 on mapped changed

We always want to reset to page 0 on reopening the all view. Currently
we do that only on some cases, like hiding the overview, but not on some
others which is necessary to achieve this. So there were bugs on some of
those cases, since the activePage was not in sync with the current page
that the user is seeing active.

To avoid that, reset to page 0 on mapped property of the main actor of
all view changes.

https://bugzilla.gnome.org/show_bug.cgi?id=734680
appDisplay: Animate folder view items

Add a new animation  to folder view based on designers mockups that
emulates pulsating icons.
The code on iconGrid is though to work well for the upcoming patches to
animate AllView and FrequentView.
viewSelector: Allow different animation types

Make viewSelector able to manage different kind of animations for pages.
This is necessary for the upcoming patch to animate AllView and
FrequentView.
appDisplay: Animate AllView and FrequentView

Following design decision, we want to animate AllView and FrequentView
when opening and closing with a swarm spring form.

This involves a few changes needed to allow that, since from some time
now, we are animating page changes in viewSelector, using only a fade
transition. However now we want to let appDisplay and iconGrid apply its
own animation.

For that we special case the change to and from apps page on
viewSelector to let appDisplay to animate its own items, using and API
on appDisplay which at the same time uses an API on iconGrid.

However animating the icons in iconGrid involves a few challenges due to
the current need of scaling icons on iconGrid on a call which uses
BEFORE_REDRAW.  We need to call animate() after the icons are already
scaled, that means however, calling after a BEFORE_REDRAW, so that
means, we have to call animate() in a call using BEFORE_REDRAW which
call a function using BEFORE_REDRAW as well, so we wait two frames to
make sure icons are scaled correctly.
appDisplay: Animate indicators out

Given that we animate indicator in, it makes sense to animate them out
as well.
Search: cleanup unused code
Search: Use AppIcon for gridResults

Currently GridResult and ListResult inherit from a base class named
SearchResult which creates a StButton as a base item.
Then GridResult put as a child of the StButton an AppIcon created on
provider.createResultObject. But, StButton lacks some features of
AppIcon like dnd, style, etc. So GridResult add those in the class and
also adds the style of the AppIcon on the theme.

Obviously that doesn't look very appealing, so instead of that, delete
the base class and provide AppIcon some API needed by
Search and then use directly AppIcon on GridResult.
Search: Animate new window of apps in AllView and FrequentView

Following design mockups, animate the icons on AllView and FrequentView
to zoom out when opening a new window of the app or when the app is not
running and the user execute it.
Search: animate icons on new window

Following design decision, animate icons on search page on new window.
Dash: Animate on new window

Following design decision animate dash icons on new window.