Buck: Fix gerrit-plugin-gwtui API build

Change-Id: Ie1bd1443cb7fa8d414b542a2fd82bbb7a3374486
ChangeScreen2: Make Ctrl-Enter work anywhere in the reply box

Bind the handler at the top of the box, rather than only inside
of the text area. This allows users to select a radio button and
then hit Ctrl-Enter to send the comment and score.

Change-Id: Ib2ebe4e83dff9ae6eb59cd5768f5699b423b6520
Apply opacity to background-color on PreferencesBox

opacity on an element applies to all child elements and cannot be
removed. This is a bit awkward when the button or text of the
PreferencesBox is white, since you can see the underneath
content. Instead just apply opacity to the background color, so
everything else in the box is no opaque.

Change-Id: Ie37cd16770030e4aca2067d37d2f6d82ac25ddfa
ChangeScreen2: Rename Send to Post

The send section makes no sense when email delivery has been
disabled. Change the action to be "Post" all of the time and
move the "and [x] send email" part to be next to it so the
entire thing reads as a sentence.

Change-Id: I708d2ea570fd40df89888e28665247151ae0475e
ChangeScreen2: Hide reply box when leaving the screen

If the reply box is open and the user clicks on a link to a
file with an inline comment, close the reply box. It should
not display over SideBySide2.

Change-Id: Idaed2f215181c75529f3cb1f3662cd7735a82dae
Merge changes Idaed2f21,I708d2ea5,Ib2ebe4e8

* changes:
  ChangeScreen2: Hide reply box when leaving the screen
  ChangeScreen2: Rename Send to Post
  ChangeScreen2: Make Ctrl-Enter work anywhere in the reply box
Merge "Buck: Fix gerrit-plugin-gwtui API build"
Merge "Apply opacity to background-color on PreferencesBox"