Move Drawer items back into DrawerActivity

Separating the items and the activity classes they call is not very
useful.
Add zip aligning to release build
Add APKs for download
replace spinner with non-functioning checkboxes
set checkboxes from key properties
include authentication keys
save flags from checkboxes
fix certify keys without sign flag
slight clarification
preserve keys that we don\'t use in the app
use usage argument if needed
save
edit ui knows it it has been changed
notify of changes
new Ids need to be saved
allow blank names and emails
final link in chain, fix compile
some fixes
pass message when key added
passphrase changes update need to save