WindowManager: improve minimize/map animations

Using the parameters from Elementary's Gala, which is generally
considered a DE that cares about eye-candy.

https://bugzilla.gnome.org/show_bug.cgi?id=732857
WindowManager: improve destroy window animation

The animation is the same for modal dialogs, but it is now
run for non modal dialogs too (matching the new behavior on
show).
In addition, we run a destroy animation for normal windows,
if they use CSD (there are technical limitations that prevent
running animations after destroy on server decorated windows)

https://bugzilla.gnome.org/show_bug.cgi?id=732857
WindowManager: update animation timings after designer review

Lapo, Jakub and Allan all agree with this.

https://bugzilla.gnome.org/show_bug.cgi?id=732857