[BW]: [NIP] Generally applicaton_delegate (and lower level callback interfaces) extended to notify bts client about starting mail message transmission (what is needed to fix GUI crashes related to GUI close while transmitting messages).
Merge branch 'master' of https://github.com/InvictusInnovations/BitShares
[BW]: [NIP] Updated application_delegate to better notify bts client side about mail message transmission states.
Merge branch 'master' of https://github.com/InvictusInnovations/BitShares