Refact: Improvements on Id and time stamp handling in classes Id, TStamp and Instance

[detlefarend]

Motivation Currently, an individual Id handling is implemented in class Instance. This shall be refactored by adding class bf.various.Id as a parent class. Furthermore, a new property id shall be added to class bf.various.Id to simplify the access to the id of child classes. Same with class TStamp and a new property tstamp.

Benefit Id handling is unified and made more pythonic.

Are the proposed changes backward compatible?

• [x] Yes
• [ ] No

Related development objects

• [x] Class bf.streams.Instance
• [x] Class bf.various.Id
• [x] Class bf.various.TStamp