…e strings

- removed unnecessary protocol info call (as we always authenticate the same way
  now)
- migrated truth for all tor configuration to ricochet.json; torrc and
  default_torrc are now reset on each launch of Ricochet-Refresh
- tor configuration now persist between runs, and config screen is now populated
  with previously used settings
- config data now no longer written to torrc
- Ricochet-Refresh will now bootstrap tor automatically if current settings have
  been used to successfully bootstrap in the past
- TEGO_THROW macros now live in utilities.hpp and are publically accessible from
  rest of Ricochet-Refresh source
- on launch, pluggable transport binary deployment directory is soft-linked to
  the current working directory
- the UI now waits until the control port connection has authenticated, fixing
  various race conditions
- added helper method to Settings.h for writing arrays of values
- improved arg validation in tor configuration pane

…ork settings config

…, updated onion service state notifications

When the ConversationModel is cleared after sending a message but before
the acknowledgement is received, Ricochet crashes.

issue #150

https://developers.google.com/protocol-buffers/docs/reference/cpp/google.protobuf.message_lite#MessageLite.ByteSize

https://doc.qt.io/qt-5/qprocess-obsolete.html#pid