CSP Sub-element Base Classes - Implement SKA States and Modes as per ADR-8 and the CS guidelines

The CS Guidelines (SKA-TEL-SKO-0000656) and the SKA Observing Control model (SKA-TEL-SKO-0000860) define the key operational states for SKA devices and for SKA observing control. These documents are in the process of being updated as a result of the decisions made as part of --ADR-8--.

Furthermore the current version of MVP does not fully implement SKA states and modes as defined in CS Guidelines, in particular adminMode and operational state are not implemented as par CS Guidelines. 

CS Guidelines define a coherent set  of states and modes  to  control and report state of the telescope and its subsystems. In some cases, adminMode is not implemented as initially  planned and operational state (reported as TANGO attribute state) does not reflect operational state of the subsystem but of the TANGO device itself.

https://confluence.skatelescope.org/pages/viewpage.action?pageId=105416556

CSP Sub-element Base Classes (Master, Subarray and Capability) will be used by all CSP Sub-elements (Mid.CBF, Low.CBF, PSS and PST) as a base for implementation of the Master, Subarray and capabilities which are specific for each sub-element. 

So far only Mid.CBF Master Control Software has been included in the SKA MVP,  it was developed before the CSP Sub-element classes were developed and has still to be updated  to use this new CSP classes as the base. The plan is to update the CSP Subelement base classes first and then update Mid.CBF to use the updated CSP base classes as the base for further development.