Move login and registration to login

To make this work `AccountManager` is split off from controller taking all the code around `AccountRegister` and is added to LibNeoChat as it makes sense to have this functionality there.

src/libneochat/CMakeLists.txt

@@ -7,6 +7,7 @@ target_sources(LibNeoChat PRIVATE
     neochatconnection.cpp
     neochatroom.cpp
     neochatroommember.cpp
+    accountmanager.cpp
     chatbarcache.cpp
     clipboard.cpp
     delegatesizehelper.cpp