Restructure Adapter communication methods

[bilderbuchi]

If we restructured Adapter and subclasses so that we can put common functionality into Adapter, that delegates to subclasses' specific implementations, we could gain several useful features without duplicating across all adapters:

• Logging of commands going/coming from adapters. (Logging traffic  #219)
• Thread safety measures (Thread safe communication #506)
• Delays between subsequent writes or reads (Add instrument: Lakeshore 421 #430)
• Maybe unify read/write termination (Add instrument: Lakeshore 421 #430 (comment))

InstrumentKit uses an approach where in the base class there are concrete methods that delegate to abstract methods that are overridden by subclasses.
The concrete methods can have common functionality (like logging) in one place, so they can observe DRY.