throughout
* Still need to redo how we're using mixins, but whatever.
* Cleans up a bit from the edit/view source etc changes too, since now
we have a little more context (oops)...
* Just hide 'view' in general because a, how much does it really add,
and b, it doesn't fit in a lot of cases when we have the extra width
from these icons regardless.
* Rename view and add section tabs to make more sense with icons/in
context/whatever ('view' is now only targeted at screen readers, and
we use a + for the new section icon, so saying 'add' is kinda...
redundant)
Bug: T197520
Change-Id: I1ab12ccda60e51035c4adec43c42508ac297c00a
Isarra