Add spacing in QS footer and user switcher.

Adds space between user avatar and name.
Adds space below user icons in switcher.
Expands avatar image to size of view.
Adjust colour of user name.

Bug: 63593747
Tested on Mojave

Change-Id: If0a42b2ecd3ffa9dc11c918d6cdf42f109b3934e
4 files changed