Highlight focus differently when pressed

Add new car-ui-lib resources to specify colors and a dimen for the focus
highlight when android:state_pressed is true. Use these resources, or
their default values, to specify background drawables when
android:state_focused and android:state_pressed are both true. Remove
an Android O workaround to prevent a ripple from appearing when the
play/pause button is pressed via rotary.

Test: manual
Bug: 168041395
Change-Id: Ic421c01676561b38c9b36e17159b1da2ccca4243
11 files changed