ADT templates: BlankActivity and LoginActivity cleanup.

- BlankActivity: fix a bug where 'none' navtype + minApi < 11 didn't check for API 11
  before using ActionBar APIs
- BlankActivity: add horizontal and vertical padding, customized for
  sw720dp-land
- BlankActivity: remove navtype that allowed tabs without swipe
- change naming convention R.menu.activity_foo to R.menu.foo
- change naming convention R.id.menu_foo to R.id.action_foo
- add simple XXHDPI icon (scaled up from XHDPI... to be replaced in a future
  update)

Change-Id: Ic5bf3dcfb13e714df505dcbf7c1227b610f0a36e
16 files changed