Suggestions popup window is dismissed on tap outside.

But now the tap is not handled at all, as it was before. To do this, the popup window
is now focusable. As a result, the TextView's window loses focus. We hide the
cursor to prevent a non-blinking visible cursor. We should also fake the
state of the parent TextView to keep it visually focussed.

SuggestionRangeSpan and SpellCheckSpan had to made Parcelable since they are recreatedi
when the TextView is re-created when the popup is dismissed.

Change-Id: Ic99b2c4f02c282394f214938dd19168547af4886