Added more use cases for signet library. Converted signet and dmessage use cases to use new interface. Updated the signet and dime apps to new interface.
Added more use cases for signet library.
Converted signet and dmessage use cases to use new interface.
Updated the signet and dime apps to new interface.

Next: Isolate interface from signet-resolver library.
Our EC keys also seem to be leaking when deserialized, need to look into it.

lavabit/libdime,lavabit/libdime,greyg00s/libdime,lavabit/libdime,greyg00s/libdime,lavabit/libdime