Add "autoAnimate" attribute to configure how scrim and title behave w…

[dmfs]

…hen collapsing the toolbar.

none - nothing will be auto-animated, i.e. values change gradually as you scroll title - the title blending will be auto-animated when the scrim height has been reached scrim - scrim will be auto-animated when the scrim height has been reached (this is the default) all - title and scrim will be auto-animated when the scrim height as been reached

Note there is another value "children" which requires the changes of another branch to work