[BW]: [NIP] Mail Editor Window is right now used also as mail viewer popup window. This allows to view mail attachment and also unifies the UI.
[BW]: [NIP] Mail viewer pane shows full public key: https://github.com/InvictusInnovations/keyhotee/issues/80
[BW]: [NIP] Mail list view shows mail sender regarding to current address book contents. Previously it displayed always cached string built at displaying message header. Thus ie new added contact to address book still was showed as public key.
Merge branch 'master' of https://github.com/InvictusInnovations/keyhotee

Conflicts:
	AddressBook/Contact.hpp
	ContactListEdit.cpp
	ContactListEdit.hpp
	Mail/MailEditor.cpp