Show updated labels for apps and DS in Sharesheet

Shows activity and app label for all share targets except those
with the right permission. Shows 2 wrapping lines as a label for
all direct share targets. Brings grid item layout closer to spec.
Fixes several associated bugs.

Fixes: 125908050
Test: included label test, manual
Change-Id: I5c2cc0700b59911d79aebf2582176497c30bf85c