Switch to Light Holo theme, clean up menu options.

- Changed the default theme to Light.Holo
- MessageCompose now has ActionBar.
- Removed unnecessary MessageCompose menu items.

- Also removed "Add Account" menu from MessageListXL.
  (Use the + button on account settings)

- Fixed "calender response section invisible" bug.

Bug 2926517

Change-Id: Id27632ec82dad158f43b0903dbc2cb219188400d
1 file changed