Created a transcriber connection type which is supposed to be a simpler
branch type. An implementation of the connection was created and related
interfaces were extended to support the connection. 
- The connection is not used yet! - but is supposed to replace the
branch type (simpler interface and simpler implementation due to less
redundant functionality).

Signed-off-by: Jakob Brandsborg Ehmsen <jakobehmsen.github@gmail.com>