Remove extra line in status updates

- Remove trailing newlines in status updates
(i.e. reshared posts have HTML block quote
tags which get turned into 2 new lines)

Couldn't find a trim() utility method in
Spanned, SpannableStringBuilder, TextUtils, or
CharSequence - it only exists in String, but converting
to a String would cause loss of span info. Instead,
we iterate to look for new line characters manually.

- Hide stream item text views if there is no text
(i.e. prevent an extra new line when there is only an
image and attribution)

- Padding fix in contact editor

Bug: 5279541
Change-Id: Ia1b77da74b18371b022d49720ab42a7b234ba331