hterm 1.11, nassh 0.8.19.3, encoding preferences

hterm 1.11: Add 'send-encoding'/'receive-encoding' preferences.

* Splits 'character-encoding' into two preferences so send and receive
  encodings can be set independently.
* Refactor Terminal.keyboard.onKeyDown_ to allow Ctrl+Alt+(printable) key
  combinations.
* Fix regression in Terminal..onPaste_.

hterm 1.10: Add 'character-encoding' preference.

* Adds a 'character-encoding' preference which can be set to 'utf-8' (default)
  or 'raw'.  When set to 'utf-8' hterm's behavior is unchanged from previous
  versions.  When set to 'raw', hterm will not attempt to decode input or
  encode output.

nassh 0.8.19.3: Update to hterm 1.11.

* Include 'send-encoding'/'receive-encoding' preferences from hterm 1.11.

nassh 0.8.19.2: Update to hterm 1.10.

* Include 'characer-encoding' preference from hterm 1.10.

BUG=None
TEST=hterm_test.html, 66/66 tests passed.
TEST=Manual testing

Change-Id: I5eb4b21862fa2d0204aa445a9c23affb822c5a7a
Reviewed-on: https://gerrit.chromium.org/gerrit/59477
Reviewed-by: Marius Schilder <mschilder@google.com>
Commit-Queue: Robert Ginda <rginda@chromium.org>
Reviewed-by: Robert Ginda <rginda@chromium.org>
Tested-by: Robert Ginda <rginda@chromium.org>

• hterm/doc/changelog.txt[diff]
• hterm/js/hterm_keyboard.js[diff]
• hterm/js/hterm_preference_manager.js[diff]
• hterm/js/hterm_terminal.js[diff]
• hterm/js/hterm_terminal_io.js[diff]
• hterm/js/hterm_vt.js[diff]
• nassh/doc/changelog.txt[diff]
• nassh/manifest.json[diff]