Add animations property to Window module
Add animations property to Window module

The design team requested that we disable the page
transition animations in the News App since it is
still too slow.

Add a new property to the Window module to set whether
we should change the GtkStack transition type or not.
The default type is GTK_STACK_TRANSITION_TYPE_NONE.

https://phabricator.endlessm.com/T10792

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib