Remove the OMC API functions

[adeas31]

Write now we have created wrapper functions for each OMC API. It very difficult to keep track of API changes. OMPython is not directly linked with OMC so it is not possible to generate these wrapper functions automatically.

I suggest we remove these wrapper functions and clean up the code. The user can still call OMC API using sendExpression.

[syntron]

PR #282 prepares this; it removes all dependencies on OMCSessionBase - currently it keeps the code alive as OMCSessionCmd but if needed, this part can be removed

I have no feelings regarding this as I do not use the interface provided here ...

The main point to keep it would be that besides 4 function it is quite simple code now. The functions are:

• getClassComment() - pyparsing.ParseException should be handled in sendExpression()
• getParameterNames() - additional check for KeyError needed?
• getParameterValue() - pyparsing.ParseException should be handled in sendExpression()
• getNthComponentModification() - ???