Remove obsolete files

[beteva]

This issue aims to make a list and ultimately remove obsolete HardwareObjects with a subsequent PR. Everyone should be able to add files to this list with, when possible, comment why the file is obsolete.
This only treats the common Hardware Objects. The site specific hardware object will be handled separately.

• BlissActuator.py - replaced by BlissNState.py
• BlissMotorWPositions.py - replaced by BlissNState.py
• BlissRontecMCA.py - not used any more
• MachCurrent.py - replaced by TangoMachineInfo.py
• MicrodiffActuator.py - replaced by ExporterNState.py
• MicrodiffBeamstop.py - replaced by ExporterNState.py
• MicrodiffFocusMotor.py - not used
• MicrodiffInOut.py - replaced by ExporterNState.py
• MicrodiffMotor.py - replaced by ExporterMotor.py
• MicrodiffSamplePseudo.py - not used
• MultiplePositions.py - replaced by MotorsNPositions
• SampleStage.py - ??
• Transmission.py - replaced by AbstractTransmission.py
• XRFSpectrum.py - replaced by AbstractXRFSpectrum.py