updates for Google OAuth2 support

needed to add token refresh/invalidate support
initial support for importing keystore
updated for OrbotHelper check for Tor
added GOAuth2 request to setup account
added online account switcher to titlebar
removed chat switcher from title/actionbar
remove explict cursor.close() where not necessary

there is an error that is constantly being thrown
but that doesn't cause the app to quite, related
to finalize() being called on a cursor that was closed,
or something of that nature. It is not necessary
to explicitly call close() on all cursors, so in these
case we will not.
added resource variable, and only use in screen/display
improved logic for refresh of GOAuth2 token
removed all resource code from this class (for now)
extended Presence to support persistence of resource data
sets resource variable in Presence class
small cleanup