DO NOT MERGE lots of OTR debug statements
show error message if sharing data when all accounts are offline

Previously, if a SEND/Share Intent was sent to ChatSecure when it was
offline, ChatSecure would just show a blank white screen.  That screen was
ImUrlActivity doing nothing at all.  When all accounts are offline, this
commit makes the blank white screen go away, and gives an error message in
a Toast.
make ChatSecure claim .ofcaes files that are opened in file managers

The IntentFilters do file associations very poorly.  These crazy hacks are
the only way I've been able to get file associations working when defining
custom types that do not have built-in mime types, according to Android
itself.
REBASE show error message if sharing data when all accounts are offline