Move call log actions into expandable view.

This isn't the prettiest thing ever, but with this the "framework" of
all of the changes for the new visual style of the call logs is in
place. From here on out, the remainder of tasks should be unblocked
and relatively independent.

+ Rename ...ItemViews to ...ItemViewHolder. This probably wasn't
completely necessary, but is more proper given the new architecture.

+ ViewHolder is now officially where most of the independent UI logic
for a single call log list item should live. This changelist moves
further in that direction by storing references and helpers in it, to
lessen what must be passed in from the adapter.

+ Split out the call action from the rest of the actions, since it
has a special treatment  on the card.

+ Convert text action buttons into a vertical stack.

+ Consolidate action stylings into a single style, for simplicity.

+ Miscellaneous style and string changes to put things in a better
state. This included tweaking some of the (ripple) backgrounds.

+ Update tests, according to changes.

Bug: 19372817
Change-Id: Ic923c0bcbbc1c153952131d0c772df9e9589fb03

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