Delete chat history when removing contact
Make Notifications aware of usePhonebookAvatars settings
Remove clear messages item from conversation menu
Minor fix
Updated reconnect algo

Using wishes from https://github.com/CODeRUS/mitakuuluu2/issues/182
Showing human-readable network error
Enabled sending logs on registration

After registration fails
Changed delete chat behaviour

In chats page separate leave group, delete group and delete history
Removed delete contacts from chats page
In contacts page deleting contacts removing chat history also
Added clear chat history actions to user and group profile menu

Following https://github.com/CODeRUS/mitakuuluu2/issues/217