Swap settings and clear passphrase menu options

Android design pattern best practice recommends placing the settings
menu item below all other items because it's not frequently needed.

In that spirit, I've also moved the clear passphrase option to be first
since it is likely to be used more often than database import/export.
Remove MMS delivery report setting

No good reason to have this cluttering up the menu when it is disabled
and not implemented.
Remove whitespace tag preference

The vast majority of users will never uncheck this option. Those who
would can send an unencrypted untagged message through the system sms
app. It would then be stored locally in the clear, but it was already
transmitted in the clear and likely stored on the recipient's side in
the clear, so the security gains of locally encrypting are low, and
again, this seems an extremely rare edge case.

By android design pattern specs for the settings menu, we should kill
this preference.
Remove sign key exchange preference

Yet another setting that most users will never touch. Workaround for
those who would is to use a different identity key per device.

Let this be a sacrifice to the android settings design pattern gods.
Reorganize settings menu

Mostly xml work, with one small hack to fix the sub menu themes, found
here: http://code.google.com/p/android/issues/detail?id=4611#c35
Sentence case settings

Let's be consistent and conformant with android style guide for settings
labels.
Make a general category, move notification settings back inline.
merge liliakai-settings