* CryptoNextBeta: (60 commits)
Lock TrustKeys if no trusted keys are available
Optimize imports
Use MD style for key trust toggle switch
Fix set/remove OnUpdateBlocklistListener
Fix axolotl database migration
Remove device list from EditAccount
Add clear devices to overflow menu in EditAccount
Ask for key trust when sending messages
Encrypt files for HTTP upload in encrypted chats
Refactor trust key ui and show in account details
Send correct body for HTTP files
Handle file transmission properly in axolotl
Remove unneccessary code
Fix trust status for outgoing messages
Don't merge messages with different trust statuses
Fix copying of axolotl keys to clipboard
Add refresh icon to v21 theme
Disable Axolotl option if not usable
Show trust status of messages' originating session
Add key trust toggle to ContactDetailsActivity
...
Add EnhancedListView library de.timroes.android:EnhancedListView:0.3.4
to enable swipe-out for ListViews
Re-enable selectableItemBackground
Dont end selectedConversation on swipe
Call mConversationFragment.reinit() instead.
Add separate undo string for swipe MUC.
Add blacklistedConversation for undo swipe
Update title_undo_swipe_* strings
Fix undo(), rename blacklistedConversation
Fix discardUndo(); re-init selectedConversation
maintain scroll position after undo
clear notification when dismissing a conversation
modified / simplified maintain scroll position code
simplify handling of selectedConversation
change undo_muc string, remove notifyDataSetChanged()
